After anal fistula surgery, there will be wounds around the anus of the patient, whether it is a fistula excision, fistula incision or fistula stitching surgery, there will be wounds around the anus, so there may be feces inside the wound when defecating. After defecation, it is best to clean the area around the anus and inside the wound with warm water or potassium permanganate solution. It is recommended to put one tablet of potassium permanganate in 5000 ml of warm water, a light red solution, and take a sitz bath on the entire anus. The inside of the wound can be cleaned with a towel, and after the cleaning is finished, the wound can also be treated with an anti-infection treatment by applying oxyfloxacin gel. It is also necessary to change the wound every day. The purpose of changing the medication is to remove the necrotic tissue inside the wound and promote the growth of fresh granulation tissue, and also to observe the healing of the wound. If good care is taken to keep the area around the anus clean and dry, etc., the wound will heal in about 1-2 weeks after the surgery.