What is 'sebum'?

Sebum is best described as the oily secretion produced by sebaceous glands in the skin. This oily substance plays a crucial role in maintaining healthy skin by providing moisture and creating a protective barrier against external factors, such as bacteria and environmental pollutants. The sebaceous glands are typically associated with hair follicles and are distributed throughout the body, particularly in areas with hair, such as the scalp and face.

This secretion helps to keep the skin hydrated and prevents it from drying out, thereby contributing to the skin's overall health and appearance. The composition of sebum includes triglycerides, wax esters, squalene, and free fatty acids, all of which work together to create this protective barrier.

In medical contexts, understanding sebum is important for discussing skin conditions like acne, where the production of sebum can be increased, leading to clogged pores and bacterial growth.