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Disorders of the Sebaceous (Oil) Glands. Seborrhea (seb-o-REE-ah) is a skin condition caused by overactivity and excessive secretion of the sebaceous glands. An oily, or shiny, condition of the nose, forehead, or scalp indicates the presence of seborrhea.ollowing are common disorders of the sebaceous (oil) glands: Comedones (KOM-e-donz), or blackheads, are a worm-like mass of keratinized cells and hardened sebum appearing most frequently on the face, chest, shoulders, and back. Blackheads accompanied by pimples often occur in youths between the ages of 13 and 20.
Sebaceous glands produce the oily, waxy substance called sebum (Latin, meaning fat or tallow) that is made of fat , wax, and the leftover dead fat-producing cells. In the glands, sebum is produced within specialized cells and is released as these cells burst; sebaceous glands are thus classified as holocrine glands. Sebum has no smell, but its bacterial breakdown can produce a bad smell.