Increased activity is seen in winter and early spring, with summer remissions common. Active phases may be complicated by secondary infection in the intertriginous areas and on the eyelids. Such children may be suffering from a diaper dermatitis variant of seborrheic dermatitis or psoriasis. Generalized seborrheic erythroderma is rare. It is more often seen in AIDS, CHF, Parkinson disease, and in immunocompromised premature infants.
Plaques are rare.
From the scalp, seborrheic dermatitis can spread onto the forehead, posterior neck and postauricular skin, like psoriasis. Skin lesions present as branny or greasy scale over red, inflamed skin. Hypopigmentation is seen in blacks. Infectious eczematoid dermatitis, with its oozing and crusting, suggests secondary infection. A seborrheic blepharitis may occur independently.