Sebaceous glands are holocrine glands that are usually associated with hair follicles. They produce an oily secretion called sebum, which is a mixture of fatty material and cellular debris. Sebum is secreted into hair follicles and helps to keep the hair and skin soft, pliable, and waterproof.
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Sebaceous glands are also responsible for acne (acne vulgaris), a common adolescent disorder.
In this condition, the sebaceous glands in certain body regions become overactive in response to hormonal changes, and their excessive secretions cause the openings of hair follicles to become dilated and plugged. The result is blackheads; if pusforming bacteria are present, pimples or boils may develop in the follicles.
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