Old scars, i.e. obsolete scars, cannot be completely removed once they appear, but the appearance of the scar can be improved through medication, physical therapy or surgery. 1. Drug treatment, for the more obvious raised old scar, generally can choose the scar injection drug treatment, commonly used in the clinic, such as injection of Trimethoprim, 5-Fu and so on. 2. Physical therapy, old scar can choose fractional laser, erbium laser and other laser treatments and liquid nitrogen cryotherapy, through such methods of treatment can achieve better results. 3. Surgical treatment, if the scar is still obvious after the treatment of the above program, it may be necessary to carry out keloid surgery, excision of the scar after the reduction of tension suture, after surgery can be used to inhibit the proliferation of keloid drugs, special parts such as earlobes and other parts of the postoperative regular radiation therapy. Usually need to pay attention to do a good job of scar care, avoid mechanical stimulation. It is recommended that patients who are willing to be treated go to a regular medical institution and choose the appropriate treatment plan according to the specific conditions of the scar.