Acne pits, the depressed scar left after acne healing, can be treated by fruit acid resurfacing, dermabrasion, and photoelectric treatment. 1. Fruit acid skin resurfacing: you can use a certain concentration of fruit acid or salicylic acid, applied to the scar area, can promote the aging keratinocyte shedding, to improve the acne pits and enlarged pores, has a certain therapeutic effect. 2. Dermabrasion: Dermabrasion is what is usually called skin grinding, using a drill with a drill bit to polish the skin of shallow pimples, and can be gradually recovered after the operation. However, it is not commonly used due to the large trauma, difficulty in post-treatment care and the possibility of pigmentation and scarring after healing. 3. Photoelectric treatment: depressed scar can also be treated by laser, through the laser on the local irradiation, can stimulate collagen rearrangement, can help repair and improve the depressed scar. In addition to the above treatments, there are also microneedle therapy and surgery. It is recommended that patients go to regular medical institutions, do not blindly treatment, so as not to cause adverse consequences.