Hair Follicles and the Pilosebaceous Unit
Hair Follicles and the Pilosebaceous Unit — the combined structure of a hair follicle and its attached sebaceous gland, which together produce hair and sebum through a shared opening at the skin's surface. This unit is central to skin lubrication and is the site where acne typically develops.
Key points
- The pilosebaceous unit consists of the hair follicle, sebaceous gland, and an associated small muscle called the arrector pili.
- Sebum produced by the gland travels up the follicle to lubricate and help protect the skin and hair.
- Acne forms when the follicle becomes clogged with excess sebum and dead skin cells, often followed by bacterial activity and inflammation.
- The density and activity of these units vary across the body, being highest on the face, scalp, and upper chest.
Frequently asked
What is the difference between a pore and a hair follicle?
In everyday language a pore usually refers to the visible opening of a hair follicle at the skin's surface, through which hair emerges and sebum is released.
Why do acne breakouts happen in the same areas?
Areas with a high density of active pilosebaceous units, such as the face, chest, and back, produce more sebum and are therefore more prone to clogged follicles and breakouts.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
