A hair follicle is a tube-like structure in the skin from which a hair grows and through which associated substances, including sebum, may be released.
Hair follicles extend from the skin surface into deeper layers of the skin and contain structures involved in hair growth. Sebaceous glands commonly empty their secretions into hair follicles.
Because follicular blockage and inflammation are central to acne development, the hair follicle is an important structure in understanding acne.
QUICK FACT
Acne begins in the pilosebaceous unit, which consists of a hair follicle, the associated sebaceous gland, and the hair.
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