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Thus any organic lesion which may produce oedema and malnutrition of the cutis and epidermis as in kidney diseases, any condition of imperfect metabolism as in dyspepsia or malnutrition, or seborrhoea, may be the predisposing cause.

It is of common occurrence in infancy, being attributed by some specialists to dentition, but by others to seborrhoea.

It is always due to the underlying disease seborrhoea, and though it progresses steadily if neglected, is yet very amenable to treatment.

Comedones may exist with acne and seborrhoea and excessive secretion of sebum.

Oily seborrhoea.—Symptoms.—This appears most frequently upon the nose and forehead and sometimes upon the scalp.