Acne blackening is caused by oxidation of lipids at the acne opening. Topical retinoids such as adapalene gel and retinoic acid cream can be used topically to promote the dissolution and excretion of lipids, and there will be adverse reactions when using retinoids initially. If the number of pimples is large and the inflammatory reaction is heavy, it is recommended to take oral antibiotics under the guidance of a specialist, and also through other medical aesthetic treatments, such as acid peels and salicylic acid topical treatments. It is recommended to avoid triggering and aggravating factors of acne, and not to squeeze with your own hands when acne appears to avoid infection.