Atopic Dermatitis

What will the patient tell you? (History)

Atopic Dermatitis (AD) is a chronic, relapsing inflammatory skin disease characterized by a defective skin barrier and immune dysregulation.

The "Itch that Rashes": Patients report intense pruritus (itching). Crucially, the itch often precedes the appearance of the rash.
The Atopic March: Patients frequently have a personal or family history of the "atopic triad": Asthma, Hay Fever (Allergic Rhinitis), and Eczema.
Triggers: They may identify flares caused by sweat, wool, harsh soaps, pet dander, or emotional stress.
Sleep Disturbance: Due to the "nocturnal itch," patients often report significant sleep deprivation and fatigue.

What will it look like? (Examination)

The presentation varies significantly by age and chronicity.

Acute Phase: Erythematous (red), ill-defined patches and edematous papules. There may be "weeping" or crusting (serous exudate).
Chronic Phase:
- Lichenification: Thickened, leathery skin with exaggerated skin lines caused by repeated scratching.
- Excoriations: Linear scratch marks and crusting.
Distribution:
- Infants: Primarily face (cheeks), scalp, and extensor surfaces (knees/elbows).
- Children/Adults: Classically flexural areas (antecubital and popliteal fossae), neck, and wrists.

Crucial Note for Darker Skin Tones

Erythema Masking: The "classic" redness is often absent. Instead, AD may appear darker, grayish-brown, or violaceous (purple).
Follicular Eczema: A common variant in Black patients where the rash presents as small, firm, "goosebump-like" papules centered around hair follicles.
Papular Variant: Small, itchy bumps on the torso and extremities are more common in skin of color than the "flat" patches seen in lighter skin.
Pigmentary Changes: AD frequently leaves behind Post-Inflammatory Hyperpigmentation (PIH) or Hypopigmentation (e.g., Pityriasis Alba), which can take months to resolve and is often the patient's primary aesthetic concern.
Dennie-Morgan Lines: Prominent folds or lines under the lower eyelids, often more visible in darker skin, indicating chronic eye rubbing.

How can you help? (Treatment)

Management focuses on restoring the skin barrier ("soak and smear") and controlling inflammation.

Barrier Repair (The Foundation):
- - Emollients: Use thick, fragrance-free ointments or creams (e.g., Petrolatum) at least twice daily. Apply immediately after bathing to "lock in" moisture.
  - Bathing: Short, lukewarm showers. Avoid harsh detergents; use "soap-free" cleansers.
Anti-Inflammatory (The Flare):
- - Topical Corticosteroids (e.g., Hydrocortisone 2.5%): Apply twice daily for up to 2 weeks for mild inflammation.
  - Topical Calcineurin Inhibitors (e.g., Tacrolimus 0.1% ointment): Suitable for facial lesions; apply twice daily for up to 6 weeks.
Oral Antihistamines (e.g., Cetirizine 10 mg): Used daily to reduce itching, especially at night.
Severe/Chronic Cases:
- - Phototherapy (Narrowband UVB).
  - Biologics/JAK Inhibitors: (e.g., Dupilumab) For moderate-to-severe AD that fails topical therapy.
Infection Watch: If a flare becomes suddenly painful or develops honey-colored crusting, suspect secondary Staph infection or Eczema Herpeticum.

Darker Skin Tones – Specific Treatment Risks:

Steroid-Induced Hypopigmentation: Excessive use of high-potency steroids can cause localized skin lightening. This is highly visible in darker skin and can be mistaken for worsening eczema or vitiligo.
Aggressive Moisturizing: In darker skin, "ashiness" (xerosis) is more visible. Using urea-based or lactic acid creams can help, but they may "sting" if the eczema is active.
PIH Prevention: Controlling the itch quickly is the only way to prevent long-term dark spots.

Education and Lifestyle Adjustments: Encourage patients to avoid triggers, wear breathable fabrics, and use gentle skin cleansers.

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