![]() It is a chronic disease restricted to the scalp, involving flaking skin without inflammation signs and pruritus. Pityriasis capitis or dandruff is a variant of SD. In immune-suppressed patients, it is more extensive, severe, and refractory to usual treatment it may be an early sign of AIDS. SD presents as erythemato-squamous patches with greasy-looking, yellow to white scales, generally symmetrically distributed on seborrheic areas such as scalp, face, chest, and back, with a seasonal pattern (more frequent during winter). It is a common reason for medical consultation (adults 1–6% and newborns 12%). The etiology is multifactorial, and it is closely related with the presence of Malassezia sp.SD is a cosmopolitan disease, affects children and young adults, and is more frequent in males than females. Seborrheic dermatitis (SD) or seborrheic eczema is a chronic recurrent erythemato-squamous condition that affects seborrheic areas (scalp, face, chest) causing flaking, erythema, and pruritus.
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