Cut by a knife, if the cut is not deep. First, use saline to rinse off the foreign tissue or sand and so on inside the wound. Second, the wound with disinfectant solution, which is often used iodine volts or alcohol, etc. can be. Third, after disinfection of the wound, gauze or dressing dressing. If the wound is deep, the first thing is still to use saline to rinse off the foreign tissue in the wound, and then to clean the wound with hydrogen peroxide, expand the wound, and eliminate the anaerobic bacteria in the deep part of the wound completely. Fourth, furthermore, too deep wounds are difficult to heal on their own, and should be debridged and sutured in the hospital after disinfection. In addition, tetanus antitoxin or tetanus immunoglobulin should be administered again to avoid postoperative tetanus infection. After all these treatments, the wound should be changed regularly and the stitches should be removed according to medical advice.