The main function of lipstick cosmetics is to give color to the lips, emphasize or change the contour of the lips, and show more vitality and vitality. This type of cosmetics is directly applied to the lips, which are the extension of the facial skin and are connected with the mucous membrane in the mouth. Its cuticle is thinner than the general skin, and there are no hair follicles, sebaceous glands, sweat glands and other accessory organs, but there are salivary glands.

Compared with the skin, the cuticle of the lips is very thin, and the water is easy to evaporate. Besides, it has poor physical irritation, is easy to be injured, and almost has no sebum film. Because it is dry and easy to become rough, it is a sensitive part that needs careful care.