Which condition is characterized by severe oiliness of the skin?

The condition characterized by severe oiliness of the skin is seborrhea. This condition involves an overproduction of sebum, which is the oily substance produced by sebaceous glands. Seborrhea often presents with shiny, greasy skin, and may be accompanied by other issues, such as dandruff or oily scalp. It can occur on various areas of the body, including the face and scalp, leading to a noticeably oily appearance.

Asteatosis refers to a condition of dry skin caused by a deficiency in sebum production, not an excess. Acne is primarily associated with clogged pores and can be related to increased oiliness, but it is not exclusively defined by severe oiliness. Xerosis is characterized by abnormally dry skin, further emphasizing that it is the opposite of oiliness. Understanding these definitions helps clarify why seborrhea is the correct answer when addressing conditions involving excessive oil production.