There are two types of wounds: a mid-thickness skin injury wound and a full-layer skin injury wound. Medium-thickness skin injury wounds: these are wounds that injure only the superficial layers of the epidermis and dermis. After healing, there is almost no scar or the scar is very light, and it is more common to see some discoloration of the injured area. Total skin injury wounds: These are wounds that involve the deeper layers of the dermis, with varying degrees of scarring (hyperplastic scarring is the most common). Common scars: superficial scars: e.g., scrapes Atrophic scars: e.g., burns Depressed scars: e.g., full-layer wounds Proliferative scars: e.g., caused by very deep wounds such as surgery and cuts What are the precautions to prevent the formation of scars? 1. Prevent postoperative infection After surgery, patients should keep the wound clean and dry, and take oral antibiotics as prescribed by the doctor to prevent infection; minimize the opportunity to go to public places to avoid cross-infection, so that the wound can achieve one-stage healing. 2. Reduce postoperative tension (1) After removing the stitches, for the parts with large tension, use no-sew adhesive tape to paste the incision in order to reduce the tension in time, and generally continue to paste for about one month. (2) Postoperative use of elastic bandage pressure bandage for 1-3 months is appropriate. 3. Strengthen nutrition to promote wound healing Rest, avoid smoking and drinking. 4. Inhibit scar proliferation medication Follow the doctor’s instructions to reasonably use drugs to inhibit scar proliferation.