Ten years of acne scars, i.e. pigmentation or scarring left behind after acne healing, can partly be removed. Depending on the type of treatment, the main methods of treatment include medication, physical therapy, laser therapy, surgery, etc. 1. Hyperpigmentation: It can be treated with hydroquinone cream, azelaic acid cream and other medications, and can also be treated with dye pulse laser and Q-switched ruby laser. 2. Hyperplastic scar: you can use topical scar removing ointment such as Mucopolysaccharide Polysulfate Cream, Compound Heparin Sodium Allantoin Gel. You can also try acid brushing, microneedling or fractional laser treatment. 3. Depressed scar: the effect of drug treatment is not good, but you can try to do microneedle treatment, fractional laser treatment, you can also do surgical treatment, such as keloidectomy, autologous fat filler and so on to improve. The above methods need to go to the regular medical institutions under the guidance of professional doctors for treatment.