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.
Seborrheic Dermatitis - Adult
In the adult, the skin fold of the lip, cheek, and nose is a common location for erythema and scale
In the adult, the external ear is a common location for erythema and scale.
Seborrheic Dermatitis - Child
In children, seborrheic dermatitis can involve the axilla, which is a location less typically seen in adults
In infants, the crural folds and diaper region are common locations for erythema and fine scale