The cuticle of both lips is not only thin, but also the granular layer is thin, so the granules and melanin in the granular layer have disappeared, so that the capillaries of dermal papilla appear dialysis red, and the lips appear ruddy.

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.

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