Acne scars, i.e. scarring left after acne healing, can be improved by laser treatment and chemical peeling. 1. Laser treatment: At the early stage of scar formation, dye laser can be used, and its selective thermal damage can act on oxygenated hemoglobin to improve the local erythema symptoms and improve the appearance of the scar. If the scar depression is more obvious, you can choose carbon dioxide fractional laser to promote epidermal and dermal exfoliation, promote collagen regeneration and epidermal repair. 2. Chemical skin resurfacing: through superficial chemical exfoliation, such as professional concentration of salicylic acid and fruit acid, while exfoliating the overgrowth of keratin in the surface layer, it can stimulate the regeneration of local collagen, so as to improve the appearance of keloid scars. The above treatments should be carried out under the guidance of a dermatologist. If treatment is needed, it is recommended to consult a regular hospital and follow the doctor’s instructions for standardized treatment.