Age

Diseases can have typical patterns at different ages. In infants, seborrheic dermatitis typically involves wider areas of the body and the scalp. In adults, involvement of the scalp and the face is seen, but it is rare to see seborrheic dermatitis involving the folds.

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  In children, seborrheic dermatitis can involve the axilla, which is a location less typically seen in adults.

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  In infants, the crural folds and diaper region are common locations for erythema and fine scale.

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  In the adult, the skin folds of the lip, cheek, and nose are common locations for erythema and scale.

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  In the adult, the external ear is a common location for erythema and scale.