Acne scars can be easily recovered by applying medication and fruit acids, etc. Acne scars damage the dermis and are less effective with topical medication, etc. Fractional laser is recommended. Acne is an inflammation of the hair follicle, depending on the depth of inflammation and recovery, there are two types of acne marks and acne scars after recovery. Acne marks are in the epidermis, and can be completely normalized with the skin after recovery. It is only a matter of time, and commonly used is mucopolysaccharide polysulfate such as Xylitol, twice a day, or azelaic acid, fruit acid peeling, and then arbutin whitening essence. Adapalene gel also has some effect in reducing acne marks. The red light in red and blue light exposure improves the efficiency of skin metabolism and is effective in improving acne marks. For acne scars, which are often manifestations of dermal involvement, topical medications are difficult to penetrate, and the only effective one at present is fractional laser, which is more expensive and painful to treat, and is usually treated once every 3 months, with better results for 3-4 treatments. For locally larger thickened scars, local closed injection of tretinoin injection is also available. Once a scar is formed, recovery and its difficulties, so early treatment and avoiding inflammation too deep is the key to prevention, and pay attention to not to buckle acne to avoid further bacterial infection to aggravate the scar.