For Patients & General Readers
Atopic dermatitis, commonly known as eczema, is a chronic inflammatory skin condition that causes red, itchy, and dry patches of skin. It often begins in childhood and is linked to a family history of allergies like asthma or hay fever. Eczema can significantly impact quality of life due to persistent itching and discomfort, and it can be prone to infections.
Clinical Overview
Atopic dermatitis (AD) is a complex, relapsing inflammatory skin disease characterized by a compromised skin barrier and immune dysregulation. It is associated with a personal or family history of atopy and often presents in conjunction with other atopic conditions.
Clinical Presentation
- Typically presents in infancy or early childhood, but can persist into adulthood or first appear in adulthood.
- Characterized by pruritus, which is often severe and can lead to sleep disturbance and excoriations.
- Lesions are typically erythematous, dry, and lichenified in chronic cases.
- Distribution varies with age: infants often have facial and extensor involvement, while older children and adults commonly exhibit flexural dermatitis (antecubital and popliteal fossae).
- Associated features may include xerosis (dry skin), Dennie-Morgan lines (infraorbital folds), and hyperlinear palmar creases.
Signs & Symptoms
Symptoms (Patient-Reported)
- Intense itching (pruritus)
- Dry, sensitive skin
- Red, inflamed skin
- Rough, leathery patches of skin
- Oozing or crusting lesions, especially when scratched
- Swelling
Signs (Clinician-Observed)
- Erythema and scaling
- Lichenification (thickened skin with exaggerated skin lines)
- Excoriations (scratch marks)
- Crusting and weeping (secondary infection)
Differential Diagnoses
| Condition | Distinguishing Feature |
|---|
| Contact Dermatitis (Allergic/Irritant) | History of exposure to a specific allergen or irritant, often with a more defined distribution corresponding to the exposure site. |
| Seborrheic Dermatitis | Typically affects scalp, face (eyebrows, nasolabial folds), and chest with greasy, yellowish scales; less pruritic than AD. |
| Psoriasis | Well-demarcated erythematous plaques with silvery scales, often on extensor surfaces, elbows, and knees; nail changes and joint involvement may be present. |
| Cutaneous T-cell Lymphoma (Mycosis Fungoides) | Can mimic eczematous lesions but may have a more persistent, indolent course with eventual development of plaques, patches, or tumors; biopsy is diagnostic. |
| Scabies | Intense pruritus, especially at night, with characteristic burrows, papules, and vesicles in specific locations (finger webs, wrists, axillae, groin); presence of mites on microscopy. |
| Nummular Eczema | Coin-shaped, well-demarcated eczematous plaques, often on the extremities; can be intensely pruritic. |
Red Flags — Seek Immediate Care
- Signs of widespread secondary bacterial infection (e.g., widespread pustules, honey-colored crusting, fever, malaise).
- Signs of eczema herpeticum (e.g., sudden onset of painful vesicles, erosions, fever, systemic symptoms).
- Severe, unremitting pruritus significantly impacting sleep, daily activities, and mental health.
- Failure to respond to standard topical therapies, suggesting a need for systemic evaluation or more aggressive treatment.
Key Investigations
- Clinical diagnosis based on history and physical examination is typically sufficient.
- Skin biopsy may be considered in atypical or refractory cases to rule out other dermatoses.
- Patch testing can be useful to identify contact allergens in patients with suspected coexisting allergic contact dermatitis.
- IgE levels may be elevated but are not diagnostic; allergy testing (skin prick or specific IgE) can identify triggers in some patients.
Management Overview
Management focuses on skin barrier repair, inflammation control, and itch reduction. This includes regular emollients, topical corticosteroids or calcineurin inhibitors, and avoidance of triggers. For severe or refractory cases, phototherapy or systemic immunosuppressants may be considered.
Disclaimer: This article is for educational purposes only and does not constitute medical advice.
Always consult a qualified healthcare professional for diagnosis and treatment.
TruelyserMD does not replace clinical judgement.