There are many cosmetic methods to treat scars. Different scar treatment methods are adopted for scars with different shapes, sizes and depths. 1, fresh scar shaping, external scar paste, external scar cream, Bak imported from the United States, injection method. 2. Old hypertrophic scars can be treated conservatively, and injection of drugs can only flatten the scars. If you want to make the scar thinner and the scar is not obvious, you must have a facelift. 3. acne scars, the best way is skin grinding surgery to flatten scars.