Scar injections are usually performed 3-6 months after the wound has healed and are one of the methods to eliminate scars. Scar injections mainly work on the proliferative phase of scarring to flatten down the raised scars and remove the scars by promoting scar maturation and softening and absorbing the scars by means of medication injections. Scar injections usually involve hormones, such as dexamethasone or other drugs. Local hormone injections need to be repeated several times before the scars can be gradually flattened and softened, and for small scars, the symptoms can be effectively relieved with 4 injections. After the scar injection, patients are advised to eat less spicy and irritating food and more light food to help the wound scar recovery. If the best time period for scar injection is missed, the expected effect may be affected. At this time, patients can choose whether to undergo surgery or radiation treatment to eliminate scars according to their individual situation after the doctor judges the recovery of scars.