Diagnosis

The diagnosis of seborrhoea oleosa is self-evident. S. sicca is to be distinguished, on the one hand, from eczema oleosa, and, on the other, from pityriasis capitis. This latter is distinctively an affection of the adult scalp, characterized by excessive hyperplasia and exfoliation of the horny cells of the epidermis, and mingled with but a scant amount of sebaceous secretion.