A pit left after laser treatment of flat warts may have damaged the skin, the initial period after treatment needs to prevent infection, and the later period needs to prevent scarring through medication coating or laser repair. 1. The initial pit is a normal phenomenon, if the recovery is good, no infection, the patient does not belong to the easy to leave scar body, then generally one or two months after the pit can be normal repair, within a year the skin can be almost no difference with the normal skin. Initially, patients need to keep the skin around the pits clean and sterilize it with iodine povidone daily. Diet should be vegetarian, no cold, oily and spicy food, and regular rest and relaxation. 2. When the pits are obviously recovered, the pits are not infected, no breakage and the pits gradually become shallow, usually two weeks after the laser treatment, you can apply silicone scar gel with the trauma to prevent excessive proliferation of scar tissue, thus preventing keloid scars from affecting the aesthetics of the normal skin. If the patient is keloid, and the excessive proliferation of scar tissue affects the patient’s normal life, it is recommended that the patient go to the hospital for treatment.