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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.
Human Anatomy Â» Basic Anatomy Â» Sebaceous Glands. Sebaceous glands are microscopic glands in the skin that secrete an oily secretion known as sebum. They are widely distributed all over the dermis of skin, except for the palms and soles. They are especially abundant in the scalp and face.