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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.
The sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum, to lubricate and waterproof the skin and hair of mammals.ebaceous glands secrete the oily, waxy substance called sebum (Latin: fat, tallow) that is made of triglycerides, wax esters, squalene, and metabolites of fat-producing cells. Sebum waterproofs and lubricates the skin and hair of mammals.