Azelaic acid is an organic compound. It is beneficial to the prevention and treatment of dental caries when used in mouthwashes, and it can prevent the surface of soap from cracking when used in soap. It has good permeability to the skin, and it can increase the absorption function of the skin when used in cream cosmetics. It is a kind of oily skin that is prone to acne and acne. It quickly removes acne, acne and acne, solves the problem of repeated acne, and tightens pores.