A 3-year-old boy is brought for evaluation of a chronic rash that has been intermittently flaring in the past year. The rash was worse in winter months. It is dry, pruritic, and patchy and is most severe on his popliteal fossa and antecubital fossa bilaterally (flexural distribution).
Follow-up visit: While his lower extremity atopic dermatitis has improved, he continues to have persistent cracked, excoriated, dry patches on his antecubital fossae bilaterally. Food allergy testing revealed no underlying food allergies. Mother is concerned about long-term complications of atopic dermatitis if it persists.
Tasks (observed):
1️⃣ What is the best initial treatment for the child’s symptoms?
2️⃣ Identify potential complications of poorly controlled atopic dermatitis.
💡 Examiner instruction: Candidate must recognize that first-line therapy for mild-to-moderate AD includes emollients (moisturizers) + topical corticosteroids for flares. Also must list complications: bacterial/viral superinfection (Staph aureus, eczema herpeticum), sleep disturbance, growth retardation, psychosocial impact, ocular complications (keratoconus, cataracts), and lichenification.
❓ Q1 (Examiner): “What is the best initial treatment for this child’s atopic dermatitis symptoms (dry, pruritic, flexural patches)?”
✅ Combination of skin hydration + topical anti-inflammatory therapy.
• First-line: Liberal use of emollients/moisturizers (ceramide-containing creams, ointments) applied daily, especially after bathing (soak and seal).
• For active flaring lesions: low-to-mid potency topical corticosteroids (e.g., hydrocortisone 2.5% or triamcinolone 0.1% ointment) applied twice daily to affected areas until clearance.
• Avoid triggers (irritants, overheating, wool).
• In flexural areas, use mild potency steroids to avoid atrophy.
❓ Q2 (Examiner): “Which of the following are potential complications of poorly controlled atopic dermatitis? (List major complications)”
❓ Q3 (Examiner): “What are the clinical features of eczema herpeticum, and how is it treated?”
✅ Widespread clusters of monomorphic vesicles, punched-out erosions, hemorrhagic crusts, fever, and malaise. Can disseminate. Treatment: systemic acyclovir (IV if severe), topical antivirals ineffective, discontinue topical corticosteroids temporarily, supportive care.
❓ Q4 (Examiner): “This child had negative food allergy testing. What is the role of food allergens in AD?”
✅ Food allergy is a trigger in 30-40% of young children with moderate-to-severe AD, especially with early onset. Most common: egg, milk, peanut, soy, wheat. Negative testing rules out IgE-mediated food triggers. Empiric elimination is not recommended. Emollients and topical steroids remain mainstay.
❓ Q5 (Examiner): “What is the role of dilute bleach baths in atopic dermatitis?”
✅ Dilute bleach baths (0.5 cup of 6% bleach per 40 gallons of water) twice weekly reduce Staphylococcus aureus colonization and improve disease severity, especially in patients with recurrent secondary infections. Rinse off and apply emollients after bath.
❓ Q6 (Examiner): “When are topical calcineurin inhibitors (tacrolimus, pimecrolimus) used, and what is the black box warning?”
✅ Used as steroid-sparing agents for moderate-to-severe AD, especially on face, neck, and intertriginous areas. FDA black box warning for potential malignancy risk (lymphoma, skin cancer), but recent evidence shows no causal relationship; benefit-risk favorable. Recommended as second-line for patients ≥2 years unresponsive to topical steroids.
❓ Q7 (Examiner): “What are the sight-threatening ocular complications of atopic dermatitis?”
✅ Keratoconus (conical deformity from chronic eye rubbing), anterior subcapsular cataracts (can occur spontaneously or from corticosteroid use), keratoconjunctivitis, blepharitis, retinal detachment. Patients with eye symptoms should have ophthalmologic evaluation.
✅ Yes. Chronic inflammation, sleep disturbance (pruritus), and malnutrition from food restrictions can lead to growth retardation and delayed puberty. Potent topical steroids (if used over large BSA) may cause adrenal suppression. Monitor height and weight regularly.
❓ Q9 (Examiner): “What is the ‘atopic march’? How does it relate to this child?”
✅ Atopic march refers to the natural progression from atopic dermatitis in infancy to food allergy, allergic rhinitis, and asthma later in childhood. This 3-year-old with AD has higher risk of developing asthma and allergic rhinitis by school age. Prevention: early aggressive skin barrier therapy.
❓ Q10 (Examiner): “For severe refractory AD, what systemic therapies are available for children?”
✅ Dupilumab (anti-IL-4/IL-13) approved for children ≥6 months with moderate-to-severe AD. Also cyclosporine, methotrexate, mycophenolate mofetil, or phototherapy (narrow-band UVB) for older children. Avoid long-term systemic steroids.
❓ Q11 (Examiner): “What is wet wrap therapy, and when is it indicated?”
✅ Wet wraps involve applying topical medication/emollient, then covering with a damp layer and dry outer layer. Indicated for severe, refractory AD or acute flares to enhance hydration and steroid penetration. Usually short-term (3-7 days) under physician supervision due to risk of maceration and infection.
❓ Q12 (Examiner): “How do you counsel a mother about preventing complications of AD?”
✅ • Daily emollients to restore skin barrier. • Treat flares early with topical corticosteroids to prevent lichenification. • Avoid scratching (short nails, antihistamines, wet wraps). • Recognize eczema herpeticum (painful vesicles) – seek immediate care. • Monitor for eye symptoms (refer to ophthalmology). • Annual influenza vaccine; avoid close contact with active HSV lesions. • Address sleep disturbance and psychosocial impact.
🗣️ Examiner high-yield pearls (AD complications):
• Eczema herpeticum = medical emergency; widespread punched-out lesions, treat with IV acyclovir.
• Keratoconus – irreversible vision loss from eye rubbing.
• Lichenification – chronic thickening from repeated scratching.
• Growth delay – monitor growth chart, ensure adequate nutrition.
• Atopic march – AD → food allergy → asthma → allergic rhinitis.
💬 To the candidate (role-play): You are seeing the 3-year-old with his mother. Explain the diagnosis of atopic dermatitis, best initial treatment (emollients + topical steroids), and discuss potential long-term complications. Address her concern about complications and the negative food allergy tests.
📝 Examiner Marking Grid (AD Station):
✅ Correctly identifies AD based on flexural distribution, chronicity, pruritus, winter worsening
✅ Recommends initial treatment: liberal emollients + low-mid potency topical corticosteroids for flares
✅ Lists major complications: eczema herpeticum, bacterial superinfection, keratoconus, cataracts, lichenification, growth delay, allergic march
✅ Explains that negative food allergy testing rules out IgE-mediated food triggers – no need for elimination
✅ Counsels on “soak and seal” bathing technique, trigger avoidance, and when to seek urgent care (fever with vesicles)
✅ Discusses long-term risk of asthma and allergic rhinitis (atopic march)
✅ Addresses psychosocial impact and sleep disturbance
🗣️ Sample candidate script (excerpt):
“Your son has atopic dermatitis, a chronic dry, itchy skin condition. The best initial treatment is daily moisturizers (thick ointments like petroleum jelly) applied after lukewarm baths to lock in moisture, and during flares we use a mild steroid cream on the red, itchy patches – for example, hydrocortisone 2.5% twice daily on the arm creases. Because his food allergy testing is negative, we do not need to avoid foods. However, poorly controlled eczema can lead to complications: skin infections (especially herpes – that causes painful blisters and fever, requiring emergency treatment), eye problems from rubbing (keratoconus), and over time, thickened skin. Good control reduces these risks and may prevent asthma later.”
📚 References: Nelson Textbook of Pediatrics 22e, Chapter 186 (Atopic Dermatitis); Eichenfield et al. Guidelines of care for AD (JAAD 2014, 2023).