TERMINOLOGY

Pilosebaceous unit : Consists of the hair shaft, the hair follicle and the sebaceous glands.
Each pore on the surface of the skin is an opening to a canal called a follicle. The follicle also contains a hair and an oil gland (sebaceous gland). The oil gland helps remove old skin cells, keeps the skin lubricated, and prevents drying of tissues.


Sebaceous glands : Part of the pilosebaceous unit .These units are found everywhere on the body except on the palms, soles, top of the feet, and the lower lip. The number of pilosebaceous units is greatest on the face, upper neck, and chest.


Sebum : Produced by the sebaceous glands
Sebum forms part of the oil that coats the skin. Sweat, lipids and environmental dirt are other ingredients of the oil on the skin. This oil protects skin from bacterial infection. It also reduces the natural water loss from the skin. It is also responsible for keeping the skin and hair moisturized.

*Less sebum: Dry skin
*Too much sebum: Oily skin