Seborrheic dermatitis is a chronic inflammatory skin disorder characterized by erythematous and greasy scaly patches.
Patches are red, inflamed, and pruritic with micaceous scale. Circumscribed patches are found on the scalp, glabella, nasolabial fold, posterior auricular skin, and anterior chest.
Variable course that seldom completely subsides. An infant form (cradle cap) usually resolves within the first few months of life.
Tends to flare with stress. The adult scalp form is commonly termed dandruff or pityriasis capitis.
Topical agents (corticosteroids, antifungals, calcineurin inhibitors, shampoos, and tar preparations) are used for mild and limited disease.
Oral antifungals are reserved for severe and recalcitrant forms.
Seborrheic dermatitis (SD) is a common inflammatory skin disorder that usually manifests as erythema and scaling of the scalp, nasolabial folds, glabella, and occasionally central face and anterior chest. It tends to worsen with stress. In infants, SD may manifest as scaling of the scalp and is termed cradle cap.
History and exam
Key diagnostic factors
- scalp itching
- scalp scaling
- glabella scaling
- nasolabial fold scaling
- postauricular scaling
- white flakes
- age <3 months
1st investigations to order
- clinical diagnosis
Investigations to consider
- skin biopsy
cradle cap in infants
limited to scalp in children and adults
limited to nonscalp area in children and adults
widespread or recalcitrant disease in adults
widespread or recalcitrant disease in children
- Actinic keratosis
- Systemic lupus erythematosus (SLE)
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