The scalp’s natural oil, produced by glands beside each follicle.
Soumm
4 September 2026
An oily secretion that lubricates hair and skin and contributes to barrier function. Production varies with genetics, hormones, age and climate.
Both excess and deficiency cause discomfort.
Aggressive washing to remove sebum often prompts more production. Gentler, less frequent washing is usually better tolerated.
See also: Scalp Barrier, Oiling.
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