Sebum
Sebum — the oily, waxy substance produced by the skin's sebaceous glands that coats the surface to help limit water loss and keep skin supple. Its output is influenced by hormones, genetics, and environment, and can vary widely from person to person.
Key points
- Sebum is made up of lipids including triglycerides, wax esters, and squalene.
- It is secreted by sebaceous glands that are most concentrated on the face, scalp, and upper body.
- Sebum production is strongly influenced by hormones, especially androgens.
- Excess sebum can contribute to oily skin and clogged pores, while too little can leave skin feeling dry.
Frequently asked
Is sebum bad for the skin?
Sebum is a normal and useful part of the skin's surface film, but an excess can contribute to oiliness and clogged pores in some people.
Can washing more remove all sebum?
Over-cleansing can strip surface oils and disrupt the barrier, which may prompt the skin to feel tight or dry rather than solving oiliness.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
