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

It’s paired with a blend of lightweight sunflower, olive, and jojoba oils that melt down makeup, sunscreen, and excess sebum without leaving skin feeling slick or weighed down. — Christa Joanna Lee, Allure, 7 Oct. 2026

But this serum is especially great for balancing sebum levels and keeping blemishes in check thanks to its high concentration of niacinamide (15%) paired with acne-fighting zinc PCA and soothing allantoin. — Sarah Y. Wu, Glamour, 7 Oct. 2026

Meanwhile, tea tree extract keeps excess sebum at bay, fighting against an oil slick T-zone, leaving skin clean and balanced but not overly dry. — Kiana Murden, Vogue, 25 Sep. 2026

The formula includes microporous silica to mattify the skin and absorb excess sebum and bakuchiol to regulate sebum over time. — Reece Andavolgyi, InStyle, 24 Sep. 2026

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