Specific methods: ① clean and disinfect the wound, first rinse the pus with hydrogen peroxide, and then rinse the wound repeatedly with normal saline. ② Disinfect the wound with 0.5% potassium permanganate or 5% iodine to kill pathogenic bacteria. ③ Treat the wound cavity, dilate the wound with a scalpel, remove the foreign body, necrotic tissue and pus in the cavity, and then clean the wound cavity with normal saline. ④ Fill the injured mouth with gauze and iodine. ⑤ wound drainage: one end of gauze is free below the wound to facilitate the outflow of wound fluid. ⑥ Postoperative treatment: diamond-shaped sealing around the injured mouth, injecting antibiotics for 5 days, changing the dressing every 3 days 1 time.