sebum

noun

se·​bum ˈsē-bəm 

: fatty lubricant matter secreted by sebaceous glands of the skin

Examples of sebum in a Sentence

Recent Examples on the Web

This blemish-banishing formula includes witch hazel, algae extract, and grape seed extract, plus vitamin E to keep pores looking tight, rein in excess sebum, and shield skin from free radicals. —Esme Benjamin, PEOPLE, 4 Sep. 2025

The researchers also noted a significant reduction in sebum— an oily substance that contributes to acne—of more than 40 percent by day seven. —Hannah Millington, MSNBC Newsweek, 2 Sep. 2025

This medical-grade formula is no exception, gently removing any excess sebum or grime that your cleanser may have missed. —Deanna Pai, Vogue, 24 Aug. 2025

Previous research has shown that people with Parkinson’s have increased amounts of sebum — an oily, waxy substance with a distinctively musky odor — on the skin. —Melissa Rudy, FOXNews.com, 21 July 2025

Word History

Etymology

Latin, tallow, grease

First Known Use

circa 1860, in the meaning defined above

Medical Definition

sebum

noun

se·​bum ˈsēb-əm 

: lubricant matter that is secreted by sebaceous glands of the skin and is composed of various lipids (such as triglycerides, fatty acids, and squalene)

Androgens, such as testosterone, play a role in the development and exacerbation of acne by stimulating the production of sebum.

—Isabella Tan, Dermatology Times

… the resulting production of sebum from sebaceous glands aids in lubrication, heat insulation, … antimicrobial activity, and delivery of fat-soluble antioxidants to the skin surface.

—Dustin H. Marks, American Journal of Clinical Dermatology

see sebocyte