Clinical Pediatrics http://cpj.sagepub.com Diagnosis and Management of Common Dermatoses in Children: Atopic, Seborrheic, and Contact Dermatitis Alan B. Fleischer, Jr Clin Pediatr (Phila) 2008; 47; 332 originally published online Dec 5, 2007; DOI: 10.1177/0009922807309421 The online version of this article can be found at: http://cpj.sagepub.com/cgi/content/abstract/47/4/332 Published by: http://www.sagepublications.com Additional services and information for Clinical Pediatrics can be found at: Email Alerts: http://cpj.sagepub.com/cgi/alerts Subscriptions: http://cpj.sagepub.com/subscriptions Reprints: http://www.sagepub.com/journalsReprints.nav Permissions: http://www.sagepub.com/journalsPermissions.nav Citations (this article cites 104 articles hosted on the SAGE Journals Online and HighWire Press platforms): http://cpj.sagepub.com/cgi/content/refs/47/4/332 Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Diagnosis and Management of Common Dermatoses in Children: Atopic, Seborrheic, and Contact Dermatitis Clinical Pediatrics Volume 47 Number 4 May 2008 332-346 © 2008 Sage Publications 10.1177/0009922807309421 http://clp.sagepub.com hosted at http://online.sagepub.com Alan B. Fleischer Jr, MD Atopic, seborrheic, and contact dermatitis can significantly reduce the quality of life of patients and their families. Although differing in specific aspects of their epidemiology, etiology, and pathobiology, all 3 dermatoses are common in the pediatric population, and they share a common treatment approach. Although effective and widely used to manage exacerbations of pediatric dermatitis, the use of topical corticosteroid remains a concern for some physicians and parents because of its potential for systemic absorption and adverse events associated with prolonged use. Newer additions to the dermatitis treatment algorithm, such as the topical calcineurin inhibitors, may provide an effective steroidsparing treatment option. Adjuvant treatments, such as antihistamines, antifungals, and antibiotics, also can provide benefit in appropriate circumstances. As there is no cure for dermatitis, a comprehensive, multipronged management strategy of preventive measures, such as trigger avoidance and periodic pharmacologic treatment, will provide patients and caregivers with the best opportunity to successfully control the disease. D also crucial to determine the appropriate therapeutic approach. This article will provide an overview of AD, SD, and CD, with particular focus on how these dermatoses manifest in infants and children, and will discuss strategies to effectively manage these disorders in the pediatric population. ermatitis comprises a group of diseases involving inflammation of the skin, with erythematous and papulovesicular morphology when acute, and erythema and scaling when chronic. The most common pediatric dermatoses include atopic dermatitis (AD), seborrheic dermatitis (SD, cradle cap), and contact dermatitis (CD, especially diaper dermatitis).1-3 As there is no cure for dermatitis, a comprehensive long-term treatment strategy based on education, prevention, and pharmacologic therapy can provide patients with the means by which to manage their disease. In addition, considerations such as appropriately balancing safety and efficacy in the pediatric population and tailoring treatment to the disease site and severity are From the Department of Dermatology, Wake Forest University School of Medicine, Winston-Salem, North Carolina. Editorial support provided by Novartis Pharmaceuticals Corporation. Address correspondence to: Alan B. Fleischer Jr, MD, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157; e-mail: [email protected]. Keywords: calcineurin inhibitor; eczema; skin disease; inflammation The Impact of Pediatric Dermatitis Clinicians who treat dermatitis are beginning to understand the effect these disorders have not only on the pediatric patient but also on the child’s family. Dermatitis can be a significant source of physical, psychologic, and economic burden for patients, siblings, and caregivers.4-7 As a result of pruritus, children with dermatitis often experience disturbed sleep, with subsequent diminishment of school performance and in some cases, behavioral problems.8,9 These children also can experience increased stress, anxiety, and low self-esteem (due in part to bullying by other children) and may not be able to take part in sports or other 332 Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer social activities.10 Parents of children with dermatitis also experience sleep disturbance and increased financial stress due to frequent doctor visits, lost wages, diminished work productivity, home care, and medications.6 Considerable emotional stress was reported in an Australian survey of families that included 48 children with moderate to severe AD; caring for a child with AD was identified in this survey as being significantly more stressful than caring for a child with insulin-dependent diabetes mellitus.11 In addition, the annual cost to the health care system due to AD alone is significant, estimated at between US$0.9 and US$3.8 billion.12 Thus, the true cost of dermatitis should be understood both in terms of the financial burden and the negative impact on quality of life. Accordingly, effective treatment of pediatric dermatitis can benefit pediatric patients, their caregivers, and society overall. Atopic Dermatitis Overview and Epidemiology Atopic dermatitis is a chronic, highly pruritic, inflammatory skin condition and is the most common chronic skin disease13 affecting approximately 7% to 17% of school-aged children in the United States.14 Onset of AD occurs in 45% of children by the age of 6 months, in 60% of children by the age of 1 year,15 and in 85% of children by the age of 5 years.16 As evidenced by an international comparison of 463 801 children aged 13 to 14 years, which evaluated the relative frequency of certain conditions over a 12month period, the prevalence of AD was shown to increase steadily in Western countries over the last 3 decades, parallel to the increase in the prevalence of asthma.17 The AD has also been linked to the development of allergic rhinitis. On the basis of these and other observations, it has been suggested that AD may be the entry point for the atopic march, that is, the progressive development of systemic allergy.18,19 333 Other conditions that also should be considered include SD, psoriasis, and neurodermatitis, as well as systemic illnesses such as malignancy, thyroid disorders, and hepatic or renal failure, all of which can cause pruritus and excoriations.23 Children with AD also may present with disease variants or associated conditions (eg, ichthyosis vulgaris, keratosis pilaris, nummular eczema, pityriasis alba, dermatophyte infections, impetigo) that can confound the diagnosis (Figure 1; Table 2).22-26 Pathobiology The etiology of AD, although not fully understood, is hypothesized to be the result of dysregulation of the immune system, particularly an imbalance of T helper 1 and T helper 2 responses, dysfunction of the skin barrier,27 and a combination of genetic and environmental factors. Recent studies have identified a subset of the genes influencing development of AD in certain patients. Epidermal differentiation complex is expressed late during the maturation of epidermal cells and has been linked to both AD and psoriasis.28 In addition, the presence of 2 loss-offunction mutations in the filaggrin gene that result in the development of ichthyosis vulgaris also are considered as strong predisposing factors for AD.29 Compared with the skin of healthy patients, both the affected and the unaffected skin of patients with AD exhibit xerosis, a key clinical characteristic of AD.27 Ceramides, whose concentrations are reduced in affected patients, are the major lipid present in the stratum corneum layer of the skin30 and are proposed to play a role in the pathobiology of AD.31 As xerosis can enhance transepidermal water loss, the skin of patients with AD often develops microfissures and cracks that allow entry of pathogens, antigens, and irritants, which may exacerbate or complicate the condition. Consequently, comprehensive, long-term management of AD should address the immune and the skin barrier dysfunctions that are characteristic of the disease. Diagnosis Diagnosis of AD is based on the presence of several essential and associated features (Table 1).20,21 Owing to the wide variety of clinical presentations and the multifactorial etiology of AD, diagnosis can be challenging. The differential diagnosis for AD includes hyper-IgE syndrome, Wiskott-Aldrich syndrome, Netherton syndrome, and juvenile dermatomyositis.22 Disease Management Atopic dermatitis is a heterogeneous disease with a clinical course characterized by alternating periods of remission (during which the patient is asymptomatic) and periodic exacerbations (flares). The goals of AD treatment are both to lengthen the time between flares and to reduce their severity. Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 334 Clinical Pediatrics / Vol. 47, No. 4, May 2008 Table 1. Essential Features Associated Features Guidelines for the Diagnosis of Atopic Dermatitisa Patient Must Have 3 or More Basic Features Pruritus Typical morphology and distribution Flexural lichenification or linearity in adults Facial and extensor involvement in infants and children Chronic or chronically relapsing dermatitis Personal or family history of atopy (asthma, allergic rhinitis, atopic dermatitis) Plus 3 or More Minor Features Xerosis Ichthyosis/palmar hyperlinearity/keratosis pilaris Immediate (type I) skin-test reactivity Elevated serum IgE Early age of onset Tendency toward cutaneous infections (especially Staphylococcus aureus and herpes simplex)/impaired cell-mediated immunity Tendency toward nonspecific hand or foot dermatitis Nipple eczema Cheilitis Recurrent conjunctivitis Dennie-Morgan infraorbital fold Keratoconus Anterior subcapsular cataracts Orbital darkening Facial pallor/facial erythema Pityriasis alba Anterior neck-folds Itch when sweating Intolerance to wool and lipid solvents Perifollicular accentuation Food intolerance Course influenced by environmental/emotional factors White dermographism/delayed blanch a. Reproduced with permission from Hanifin JM and Rajka G.20 Table 2. Differential Diagnosis of Atopic Dermatitis23-26,a Disease Contact dermatitis Dermatitis herpetiformis Dermatophyte infections (including tinea pedis/manuum) Immunodeficiency disorder Impetigo Lichen planus Neurodermatitis Psoriasis Scabies Seborrheic dermatitis Systemic diseases Distinguishing Features Positive exposure history, rash in area of exposure, absence of family history Vesicles over extensor areas and associated enteropathy Serpiginous plaques with central clearing, positive potassium hydroxide preparation History of recurrent infection Infection by streptococci or Staphylococcus aureus, infection often preceded by minor skin injury (eg, insect bite), presents as small vesicles of blisters that rupture and leave behind a crust (sometimes honey-colored) on the surface of the lesion Eruption appears over the course of several weeks, absence of family history, may be associated or preceded by a stressful event, most common in the 30-60 year age group Usually, a single patch in an area accessible to itching; absence of family history Localized patches on extensor surfaces, scalp, buttocks; pitted nails Papules, finger web involvement, positive skin scraping Greasy, scaly lesions, absence of family history Findings on complete history and physical examination vary by disease a. Adapted with permission from Correale et al.23 Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer Figure 1. 335 A variety of different conditions can initially present with morphology similar to that of atopic dermatitis. Nonpharmacologic Approaches Education and Prevention. Education plays an important role in management of all types of dermatitis. With respect to patient and family education, it is important that clinicians anticipate parental anxiety about dermatitis and its treatments. With proper education, children and their caregivers will be able to understand the chronic nature of the disease and have realistic expectations about its course and treatment. Trigger avoidance. Although the factors that trigger AD flares can vary between patients, conscientious trigger avoidance and proper skin care help prevent flares.32,33 Common triggers for AD flares include exposure to harsh detergents or soaps, various chemicals, and toiletries containing alcohol, fragrances, preservatives, and astringents.34 Data concerning the significance of aeroallergens, such as dust mites and animal dander, in AD are inconclusive and complete avoidance is not possible.34 Food allergies also may trigger AD flares in some children, the offending Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 336 Clinical Pediatrics / Vol. 47, No. 4, May 2008 foods most often being milk, eggs, peanuts, soy, wheat, or fish.33 Parents should not overly restrict the diets of children who have AD, because such practice has resulted in malnutrition in some cases.35 Although triggers can be difficult to pinpoint with currently available methods, allergy testing may be of benefit in individuals with a clear allergic trigger or with dermatitis that is difficult to manage or refractory to treatment. Negative skin-prick or serum tests, in particular, are valuable for their predictive ability in ruling out suspected allergens.34 Proper skin care. As mentioned previously, xerosis is characteristic of AD; thus, its prevention and treatment are essential. Bathing is generally considered helpful because it hydrates the skin and enhances penetration of topical therapies.36,37 However, children with AD should not be bathed too frequently, as water evaporation after bathing can dry the epidermal barrier and exacerbate xerosis. Lukewarm water and mild cleansers are recommended; it is best to avoid highly fragranced soaps and bubble baths. Importantly, moisturizers should be liberally applied within 3 minutes after the bath to minimize water evaporation from the epidermis and maximize moisture retention.37 Ceramide-rich barrier repair mixtures and other moisturizers, emollients, and hydrophilic ointments may improve symptoms associated with AD by enhancing moisture retention within the skin and providing a mechanical barrier to irritants.30,37 These and other moisturizers should be applied 2 to 3 times daily for best effect. Ointments are more effective than creams, though lack of compliance, particularly among school-aged children, can limit their usefulness. In these cases, ointments may be most successfully applied while children are sleeping. In addition, hydrogels may provide relief from pruritus, burning, and pain associated with AD and other types of dermatitis. These devices are described in further detail in the context of CD treatment. Disease flares, which can be triggered by seasonal variation, vaccinations, respiratory illness, bacterial infections, and allergies, among other factors, are often unavoidable despite conscientious trigger avoidance and proper skin care.22 It is, therefore, important that children and their families understand and recognize flares as short-term setbacks that may require pharmacologic intervention. Pharmacologic Management Mild or moderate (minor) AD flares involve itching and moderate erythema with few or no excoriations, papules, or lichenification, but can quickly progress to severe (major) AD flares involving persistent, intense itching, erythema with extensive excoriations, oozing and crusting, and pronounced lichenification. In treating children with severe flares, it can be challenging to balance caution and effective treatment. Topical agents that inhibit the inflammatory response are mainstays of therapy, with appropriate management tailored to the site and severity of the flare and the age of the patient. Although families of children experiencing severe flares can be understandably anxious, some of their concerns can be alleviated by clear, detailed explanations of treatment agents and their use. An open dialogue on these subjects encourages children to take an active role in their own treatments and may improve patient and family compliance. Topical corticosteroids. Topical corticosteroids (TCSs) have been used for the treatment of AD flares for several decades. The anti-inflammatory effects of TCSs include diminishment of dermal edema and capillary dilation, attenuation of the humoral inflammation process, and reduced movement of inflammatory cells within the skin.38 In a classic clinical trial, hydrocortisone acetate effectively resolved long-standing symptoms of AD in 66% of children and adults evaluated, although beneficial results diminished 4 to 5 days after hydrocortisone was discontinued.39 Despite widespread use of TCSs, the results of a large meta-analysis indicate that existing clinical trials do not adequately compare their efficacy and do not provide a clear consensus on appropriate dosing regimens.40 Topical corticosteroids are grouped according to their potency and are selected based on disease severity, area of the body affected, and age of the patient. A stepwise approach to treatment is appropriate, beginning with the lowest-potency steroid likely to be effective and avoiding underdosing to minimize the risk of flare rebound.40 Table 3 lists some commonly available corticosteroid agents according to potency.41 Application frequency can be decreased from twice daily to several times weekly after flare symptoms are controlled and a less potent TCS can be used. Available data do not support the efficacy of short-term bursts of more potent corticosteroids versus long-term use of mild agents for children with mild to moderate AD.42 Although TCSs offer effective treatment for AD, adverse events (AEs) associated with long-term use limit their clinical use.40 Three weeks of continuous Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer Table 3. Relative Potency of Select Topical Corticosteroidsa Potency Class 1 (superpotent) Class 2 (potent) Class 3 (upper midstrength) Class 4 (midstrength) Class 5 (lower midstrength) Class 6 (mild strength) Class 7 (least potent) 337 Topical Corticosteroid Betamethasone dipropionate 0.05% ointment/gel Clobetasol propionate 0.05% ointment/cream Diflorasone diacetate 0.05% ointment Halobetasol propionate 0.05% ointment/cream Amcinonide 0.1% ointment Betamethasone dipropionate 0.05% ointment Desoximetasone 0.25% ointment/cream; 0.05% gel Fluocinonide 0.05% ointment/cream Halcinonide 0.1% cream Betamethasone dipropionate 0.05% cream Betamethasone valerate 0.1% ointment Fluticasone propionate 0.005% ointment Mometasone furoate 0.1% ointment Triamcinolone acetonide 0.5% cream Betamethasone valerate 0.12% foam Clocortolone pivalate 0.1% cream Desoximetasone 0.05% cream Fluocinolone acetonide 0.025% ointment; 0.2% cream Flurandrenolide 0.05% ointment Triamcinolone acetonide 0.1% ointment/cream Betamethasone dipropionate 0.05% lotion Betamethasone valerate 0.1% cream/lotion Fluocinolone acetonide 0.025% cream Flurandrenolide 0.05% cream Fluticasone propionate 0.05% cream Hydrocortisone butyrate 0.1% cream Hydrocortisone valerate 0.2% cream Prednicarbate 0.1% cream Triamcinolone acetonide 0.1% cream/lotion Alclometasone dipropionate 0.05% ointment/cream Desonide 0.05% cream Fluocinolone acetonide 0.01% cream/solution/oil Topicals with hydrocortisone, dexamethasone, flumethasone, methylprednisolone, and prednisolone a . Adapted with permission from Del Rosso and Friedlander.41 or intermittent TCS treatment has been shown to substantially decrease collagen synthesis in the skin,43 causing local AEs such as skin atrophy, striae, telangiectasias, hypopigmentation, rosacea, perioral dermatitis, and acne.40,44 Topical corticosteroids therapy should, therefore, be used conservatively and should be limited to 3 to 7 days in patients with acute AD, and to 2 to 3 weeks in those with chronic symptoms.45 Topical corticosteroids also may be absorbed systemically when used on thin, highly absorptive skin areas, such as the face and groin, and they are associated with greater potential for AEs.46,47 Rare but significant AEs can include suppression of the hypothalamic-pituitary-adrenal axis, growth retardation, and reduced bone density, all of which are of particular concern in the pediatric population.40,46 Cushing’s syndrome, cataract formation, and glaucoma also may occur.46 Prolonged use of TCSs, particularly on highly absorptive skin areas, is therefore contraindicated.46 Step-down to nonsteroid pharmacotherapy. Because of the potential for AEs related to TCS treatment, parents and physicians should routinely monitor their children’s treated skin for potential AEs and to gauge therapeutic response. As an alternative to long-term steroid therapy, patients can be stepped down to nonsteroid pharmacotherapies, such as topical calcineurin inhibitors (TCIs), after initial treatment with appropriate TCSs (Figure 2). Alternatives to TCS therapy are valuable for a variety of situations, including symptom relapse after TCS therapy, steroid insensitivity, steroid allergy, and the so-called steroid phobia, in which parents refuse TCS therapy out of concern about potential AEs.48 In such cases, Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 338 Clinical Pediatrics / Vol. 47, No. 4, May 2008 Figure 2. The management of atopic dermatitis. Long-term management requires daily preventive care and pharmacologic treatment with topical corticosteroids, topical calcineurin inhibitors, and adjunctive therapies (when appropriate). TCI = topical calcineurin inhibitor; TCS = topical corticosteroid. parents’ fears about AEs have implications for treatment compliance. In a recent investigation, 72.5% of the respondents worried about TCS use on their own or their children’s skin, and 24% of the respondents reported noncompliance with therapy as a result.48 Additionally, the results of the International Study of Life with Atopic Eczema (ISOLATE) underscore the need not only for accurate family education about safety, potency, and appropriate use of TCSs,48 but also for steroid-sparing treatment alternatives. Topical calcineurin inhibitors. Recent findings indicate that 62% of patients (aged >13 years) and 74% of caregivers would prefer to prevent an AD flare from occurring or getting worse through use of a nonsteroidal treatment.7 The TCIs tacrolimus and pimecrolimus offer an alternative to steroid treatment and have become part of an effective long-term treatment strategy for many patients. These agents inhibit the action of calcineurin and block T-cell activation and the production of inflammatory cytokines,49,50 a more selective mechanism of action than that of the TCSs. Tacrolimus and pimecrolimus have been effective and well tolerated as short-term and intermittent longterm treatment in clinical trials of adults and children. The most common AE noted during clinical trials of TCIs was a transient burning sensation at the application site that diminished during further treatment.51 In one clinical comparison, the efficacy of 0.1% tacrolimus ointment was comparable to that of 0.1% hydrocortisone butyrate ointment in the treatment of 570 adults with moderate to severe AD.52 Skin burning and pruritus were the only AEs with a significantly higher incidence in the tacrolimus group than in the hydrocortisone group.52 Additional clinical trial data have shown that tacrolimus enhances quality of life, reduces flare incidence, and provides safe, effective treatment of cutaneous symptoms and pruritus in patients aged ≥2 years with moderate to severe AD.51,53 A retrospective chart review has also suggested that tacrolimus is effective in children Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer aged <2 years; AEs such as burning, pain, stinging, and itching at the application site are uncommon.54 Pimecrolimus, indicated for the short-term, noncontinuous chronic treatment of AD in adults and children aged ≥2 years, is effective for preventing the progression to flares, reducing the severity of flares, and prolonging the time between major flares.55-57 Treatment with pimecrolimus has been shown to reduce pruritus and other cutaneous symptoms associated with AD.55,56,58 Thus, pimecrolimus can help break the itch-scratch cycle that can exacerbate AD. Clinical trial data have also indicated that pimecrolimus significantly improves patients’ quality of life after 6 weeks of treatment.59 Although pimecrolimus is not indicated for use in infants aged <2 years, it has been found to be effective in this population, with most AEs related to disorders commonly encountered in early childhood or commonly observed in AD.59-61 Furthermore, early application of pimecrolimus at the first signs or symptoms of a flare has been shown to prevent flare progression.55,57,60 Additional trials evaluating the safety and efficacy of pimecrolimus in infants and children aged <2 years are currently under way.62 Pharmacokinetic studies indicate that tacrolimus and pimecrolimus exhibit minimal systemic absorption, perhaps explaining the low incidence of AEs,63-65 and do not cause systemic immunosuppression.65-71 If symptoms persist for more than 6 weeks, the physician should confirm the diagnosis of AD, and if it is confirmed, treatment with TCIs may be continued beyond 6 weeks with frequent reevaluation. Since their introduction TCIs have been used to treat several million people worldwide72-74; however, postmarketing case reports of skin cancer and lymphomas prompted the US Food and Drug Administration to recommend the addition of a boxed warning to TCI labeling, indicating that long-term safety of TCIs has not yet been established and that their use carries a theoretical risk of malignancy. Importantly, case reports of malignancies associated with TCI therapy do not distinguish between preexisting and posttreatment conditions. Furthermore, lymphomas reported in postmarketing surveillance are not of the posttransplantation lymphoproliferative disorder type, which is characteristic of systemic immunosuppression. In light of these data, several professional organizations have subsequently issued statements indicating that the data do not support a causal link between TCIs and malignancy.72,75-77 339 Adjunctive therapy. Although no objective evidence currently exists to support the use of antihistamines in treating AD,78 these agents often are used for their soporific effect and to help break the itchscratch cycle at nighttime. The resulting improvement in children’s sleep quality may benefit children by improving their daytime alertness and school performance and, owing to less nighttime disruption, enhance the families’ overall quality of life. Both children and adults with AD are at increased risk for secondary bacterial, viral, and fungal infections, and in such cases, anti-infective agents become necessary.32,44,79 Topical or systemic antibiotics may be used, but treatment duration should be optimized to reduce the associated risk of tachyphylaxis. Infection with herpes simplex virus is of particular concern in children with widespread AD, and antiviral therapy is warranted in such cases. Although cyclosporine, mycophenolate mofetil, azathioprine, and interferon-γ have been used to treat AD,79 systemic immunomodulatory therapy should be avoided in children except in extremely severe cases.80 Seborrheic Dermatitis Overview and Epidemiology Seborrheic dermatitis is a chronic, recurrent, inflammatory skin condition that typically affects areas of the skin that are well supplied with sebaceous glands (eg, nasolabial folds, ears, eyebrows, scalp, chest, etc).81,82 As with AD, the etiology of SD is not completely understood although its presence has been associated with overgrowth of yeast species such as Malassezia (previously Pityrosporum) that normally inhabit sebaceous skin.83 Hormone levels, nutritional deficiencies, fungal infections, altered essential fatty acid patterns, and neurogenic factors can also be associated with SD.84 Diagnosis of SD is, therefore, based on location, appearance of the dermatitis, and patient age. In children, SD has a bimodal peak of occurrence, commonly appearing in both infancy (cradle cap) and after puberty (dandruff). Cradle cap appears in infants within the first 3 months of life, is self-limiting, and commonly resolves by the age of 1 year.3 Because of this onset and resolution, it has been suggested that transplacental hormones (the levels of which are elevated in infancy and decrease by the first year of life) may be a causative factor.3,85-87 Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 340 Clinical Pediatrics / Vol. 47, No. 4, May 2008 Cradle cap is characterized by nonpruritic, thick, greasy scales (white, off-white, or yellow) on the vertex of the scalp. Although the center of the face, ears, and forehead may have fine scaling, generalized SD (ie, SD appearing on the flexural folds) is uncommon in healthy children and is usually associated with immunodeficiencies. Therefore, infants with generalized SD should be evaluated for more serious disease.84 Dandruff typically appears during puberty when sebaceous glands have matured. Pubescent scaling in the nasolabial creases, pinnae, eyebrows, retroauricular areas, glabella, eyelids, and aural canals may also occur.1 In a survey of 1116 Australian children, the overall prevalence of SD was 10% in boys and 9.5% in girls.88 In most children (72%), SD was minimal or mild, and the highest prevalence occurred in the first 3 months of life and decreased rapidly by the age of 1 year. Cradle cap (mostly minimal to mild) was evident in 42% of children.88 Although SD is reported to be rare between infancy (ie, resolution of cradle cap) and adolescence (ie, appearance of dandruff) due to the immaturity of sebaceous glands,89 a recent, crosssectional study of 300 children found that SD was present in 6% of children between the ages of 2 and 10 years (roughly 3 times less prevalent in children less than the age of 2 years).90 The SD in the 2-yearold to 10-year-old children appeared as both the greasy-scale SD characteristic of cradle cap as well as the fine, nongreasy scale seen in dandruff.90 Although more study is needed to confirm the prevalence of SD between infancy and puberty, physicians should note that SD in this age group may occur. Diagnosis Diagnosis of SD in children involves an evaluation of patient history (onset of SD, attempts by family of treatment) and physical examination of the type, location, configuration, and pattern of scales.3 As mentioned, cradle cap (greasy, nonpruritic white, offwhite, or yellow scales) appears predominantly on the vertex of the scalp. Differential diagnosis includes AD, tinea capitis (rare in infancy), and psoriasis.3 In adolescents, the appearance and the distribution of scales render diagnosis straightforward. Differential diagnosis includes the same conditions listed for differential diagnosis of cradle cap, with the addition of histiocytic disorders and dermatomyositis. The appearance of SD in adolescents is rarely confused with other dermatoses, with the exception of psoriasis. In psoriasis, however, lesions may extend onto the forehead, whereas SD is confined to the scalp.1 Disease Management The treatment of childhood SD involves parent and patient education, as well as nonpharmacologic (hygienic) and pharmacologic strategies. Education Parents who seek medical attention for their child’s cradle cap should be informed that the cause is unknown and should receive brief explanations of the existing theories. The main message to parents is that cradle cap can be easily and effectively treated and that it usually resolves within the first year of life. Possible regimens for treatment and care should be discussed and should be accompanied by printed instructions that parents can take home. Similarly, parents and adolescent patients should be educated regarding treatment regimens for adolescent SD. Treatment of Cradle Cap The treatment of cradle cap is very straightforward and consists of a combination of scale loosening and shampooing. In mild cases, daily shampooing with a nonmedicated shampoo for 1 week may be effective in loosening and removing scales, and emollients can be applied to loosen scales should simple shampooing prove ineffective. Emollients can be left on the scalp overnight and white petrolatum or slightly warmed mineral or olive oil can be applied to the scalp for a minimum of 20 minutes. Subsequent to the emollients, the scales can be gently removed with an infant hairbrush or fingertips, followed by a nonmedicated shampoo.3,91 Treatment of Adolescent SD The management of adolescent SD involves a combination of nonpharmacologic and pharmacologic approaches. Emollients help relieve xerosis23 and frequent cleansing of the affected area removes excess oil from the skin and is part of a preventive strategy.91 Antifungal creams, such as ketoconazole, and antifungal or antidandruff shampoos are part of first-line pharmacologic therapy81,92 and are used to Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer decrease colonization by yeasts.93 The recently approved 2% ketoconazole gel, Xolegel, has been shown to improve erythema and scaling scores, as well as the Investigator’s Global Assessment score in children aged 12 years and older.94 The product is applied once daily to the affected area for 2 weeks.94 The most common adverse reactions are application-site burning and headache.94 Short courses of low-potency TCSs aid in resolution of erythema and itching and are a common treatment. The TCIs have been proposed as a steroid-sparing therapy for SD,84 and several smallscale studies and case reports have suggested that tacrolimus and pimecrolimus may be useful in adults with this condition.93,95-100 The most common side effects are mild local burning and irritation.93,95,98 Further study is needed in adolescent patients with SD to evaluate the utility of this treatment option. Contact Dermatitis 341 buckles) is the most common form of pediatric ACD, but is still relatively rare.102 Lip-Licking or Drooling Lip-licking is localized to the area around the mouth; saliva and air mix to cause a dryness that can become inflamed.102 The drool of teething infants may cause ICD of the perioral area, neck, and chest.22 First-line treatment of these straightforward ICDs involves minimizing trigger exposure by use of protective barriers as complete trigger avoidance in children and infants in these cases is difficult. For example, in the case of teething infants who develop ICD of the perioral area, neck, and chest because of chronic skin exposure to saliva, food, and saturated bibs, a thick emollient may act as an effective barrier when applied before and after meals.22 Similarly, emollients for the perioral area of children who lick their lips (especially in the winter months) can provide an effective barrier. Overview The CD is caused by direct skin exposure to an allergen or irritant101 and is categorized into 2 common subtypes: irritant CD (ICD) and allergic CD (ACD).101 Environmental factors are primarily responsible for these dermatoses, especially in the case of ICD. The ICD is a result of cellular injury caused by direct chemical contact with common triggers, such as soaps, detergents, solvents, acids, and alkali. The ICD may occur minutes to hours after exposure to a strong irritant (acute reactions), or after repeated exposure to milder agents (cumulative insult reactions). The ACD occurs in individuals previously exposed and immunologically sensitized to a particular chemical, such as nickel sulfate (commonly found in everyday items such as keys, buttons, and clothing), or pentadecylcatechols (the active agent in poison ivy, poison oak, and poison sumac).101 The ACD is similar to AD in that the disease is manifested through immune-mediated mechanisms, specifically a type IV (delayed-type) hypersensitivity reaction.101 Contact Dermatoses in Children In infants and children, the most common forms of ICD are lip-licking or drooling and diaper dermatitis.102,103 Other forms of ICD in children are uncommon.102 Nickel allergy (from snaps on clothing or on belt Diaper Dermatitis Diaper dermatitis, the most common dermatologic problem in infancy,103 results directly from the irritation caused by diapers.3 Prevalence is estimated to be between 7% and 35% but is almost certainly underreported.3,104 Diaper dermatitis most commonly occurs in infants 9 to 12 months of age, and almost half of all diaper-wearing infants and children seen by pediatricians will experience diaper dermatitis.2 The warmth and wetness of the diaper area create an impairment of the barrier function of the skin.103 Moisture renders the skin more fragile and thereby makes the skin more vulnerable to damage caused by friction, which occurs in the areas covered by diapers (abdomen, buttocks, genitals).2 Exposure of the skin to urine and feces also compromises the skin and increases the permeability of irritants. Although the pathogenic significance of Candida albicans in the induction of diaper dermatitis remains unclear, extensive colonization increases severity of the dermatitis.2,103 Diaper dermatitis, which is self-limiting with a mean duration of 2 to 3 days per episode,2 most commonly presents as erythema and mild scaling of the buttocks, thighs, lower abdomen, and gluteal crease but may also present as shiny plaques or erosions with a macular, papular, or vesicular composition.3,103 Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 342 Clinical Pediatrics / Vol. 47, No. 4, May 2008 Differential diagnosis includes AD, psoriasis, and SD. The child’s hygienic routine should be discussed with parents, and potential irritating agents used for the child’s cleansing routine should be identified. Firstline treatment includes hygienic measures, such as increasing the frequency of diaper changes, ensuring adequate airflow into diapers (ie, fastening diapers loosely), or, when possible, allowing the infant or child to remain diaper-free. The use of disposable diapers designed to be superabsorbant that provide a barrier between wetness and the skin should be used instead of cloth diapers. Water-repellant barrier creams (eg, zinc oxide) should be applied to areas prone to wetness and friction, and frequent bathing (once or twice daily) is also recommended. The use of baby wipes that contain fragrances or alcohol should be avoided, as they may further irritate the skin.2,103 If diaper dermatitis persists after these conservative measures, a short course of 1% hydrocortisone cream (twice daily for a maximum of 2 weeks) can be applied to decrease inflammation, alone or, if C albicans colonization is extensive, in combination with an antifungal cream. Until recently, no topical antifungal was indicated for the treatment of diaper dermatitis in infants. In 2006, however, an ointment containing 0.25% miconazole nitrate in a base of zinc oxide and white petrolatum was approved by the US Food and Drug Administration for the adjunctive treatment of diaper dermatitis specifically complicated by C albicans.105 Although not indicated for the treatment of diaper dermatitis in the United States, short courses of low-potency, nonhalogenated TCSs are often prescribed. Higher-potency TCSs (both alone and when used in combination products) should be avoided for the treatment of diaper dermatitis due to the AEs covered in the section on AD.2 When a secondary bacterial infection is suspected due to the decreased integrity of the skin, a topical antibiotic is appropriate.2 Nickel ACD Nickel ACD, the most common ACD in infants, produces a pruritic dermatitis that is difficult to distinguish from AD. The location and pattern of exposure is helpful in differentiating nickel ACD from AD; the area where the child has exposure to nickel snaps or buttons is the most frequent area of presentation. The only cure is to remove the allergen; inflammation can be controlled with a short course of a nonhalogenated TCS.1 Contact Dermatoses in Adolescents Adolescents also suffer ICD and ACD. Due to the adolescent’s mobility and independence, the range of irritating substances and potential allergens is increased. As with ICD or ACD in infancy and childhood, trigger recognition and avoidance are paramount, and conservative measures should be used as a first-line treatment. During an outbreak of ICD or ACD, skin should be cleansed with minimal use of soap, relying instead on plain water to remove dry particulates from the skin, and a slurry of fine cornmeal and water to remove soil or grease. Mild soaps with neutral pH can be used as needed to fight microbial contamination. Skin hydration and emollients may be useful in treating ICD. Wet compresses with Burow’s solution help reduce the discomfort of ACD lesions and have a mild antimicrobial effect.101 Other treatments, such as TCSs, antihistamines, phototherapy, and systemic agents, may be useful, depending on the severity of the disease and the age of the patient. The TCIs may offer a steroid-sparing treatment for some forms of CD.106-111 Evaluation of tacrolimus ointment has shown a treatment benefit in nickel allergy,107,109 protein contact dermatitis,106 and eyeglass frame dermatitis.107 Similarly, pimecrolimus has exhibited efficacy in the treatment of nickel110 and chronic hand dermatitis.111 Further study in pediatric populations is warranted to fully evaluate these treatments. Hydrogels, which can consist of a water-soluble network of polymer chains, a colloidal gel in an aqueous dispersion medium, or superabsorbent natural or synthetic polymers, are recently introduced medical devices that may speed lesion healing in some patients with CD. In a clinical trial of 20 men and women aged 18 to 65 years, the efficacy of a nonsteroid hydrogel compound was demonstrated in treatment of ICD induced by exposure to sodium laurel sulfate.112 Further data are needed to determine whether hydrogels will prove superior to highquality moisturizers in the treatment of CD and to test these treatments in children. Conclusion The AD, SD, and CD comprise a group of chronic diseases that can significantly affect quality of life for children and their families. Comprehensive treatment of these conditions requires the integration of Downloaded from http://cpj.sagepub.com by Roberto Hernandez Sampieri on October 12, 2008 Managing Pediatric Dermatitis / Fleischer appropriate nonpharmacologic and pharmacologic therapies. With respect to AD, 75% of patients and caregivers indicate that effectively controlling their disease would be the “single most important improvement to their quality of life.”7 Proper skin care and trigger avoidance are key components in preventing exacerbations, but most patients will experience periodic disease flares and recalcitrant dermatoses that require pharmacologic treatment. The TCSs are a mainstay of therapy, but their clinical utility is limited by AEs associated with long-term use. The TCIs provide a means of stepping down to nonsteroidal pharmacotherapy after initial treatment with TCSs. The occurrence of SD typically exhibits a bimodal pattern, with peaks during infancy and after puberty. Although SD is considered rare between infancy and adolescence, clinicians should remain alert to the possibility of the disease among children in this age group. Antifungals and low-potency TCSs are commonly used to treat this condition and its symptoms, and emerging data suggest that TCIs may be useful as steroid-sparing therapy. The optimal management of irritant and allergic forms of CD requires collaboration between clinicians and parents or patients to identify triggers and implement strategies for minimizing or avoiding exposure to these factors. A variety of barrier treatments and topical therapies may be beneficial. As therapies for common dermatoses continue to evolve, clinicians are being presented with broader options that may enhance prospects for tailoring treatment to the individual patient. 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