A disease of the sebaceous glands: Seborrhea is characterized by excessive secretion of sebum or an alteration in its quality, resulting in an oily coating, crusts, or scales on the skin.

A functional illness of the sebaceous glands is marked by a morbidly increased discharge in the amount of the sebaceous matter, usually resulting in an excessive amount of sebum.

A redness and scaling in the nasolabial creases: Because Agatha had an itchy nose which was becoming red and scaly, she went to her doctor who informed her that it was a case of nasolabial seborrhea and was typical of a deficiency of vitamin B.

Seborrhea of the scalp: Peter noticed that his head was itching, and his dermatologist said that he had a condition of seborrhea capitis, a disease relating to the increase and quality of the fats formed by the sebaceous follicles.

A variety of seborrhea characterized by the formation of large, platelike (fishlike) crusts: Arthur was surprised when he noticed the development of big and dry layers on his skin, which the doctor later described as seborrhea ichthyosis.

Seborrhea of the sebaceous glands of the nose: Seborrhea nasi is an extensive sebum production on the nose, causing it to become quite oily.

Chromhidrosis in which there is a dark, greasy-looking discoloration of the eyelids and adjacent skin. with pigmented crusts: After being examined by the dermatologist, Jane was informed that she had a case of seborrhoea nigricans, a condition which had to be treated at once.

A form of seborrhea characterized by an excessive oiliness of the skin, especially in the area of the forehead and the nose: Seborrhea oleos is a disease distinguished by an undue amount of secretion of sebum or a change in its quality causing crusts, scales on the skin, or an oily coating on the skin.

A form of seborrheic dermatitis characterized by dry scaling: Stella's hands were becoming extremely dry and, after her dermatologist examined her skin, she was told that she had seborrhoea sicca, which caused the dryness of the skin to be itchy and to peel off.

Seborrheic dermatitis occurring in a newborn infant: When Susi was a baby, she suffered from seborrhea squamosa neonatorum, which was a disease of her skin.