You can use potassium permanganate for sitz baths after anal fistula surgery. The fistula is usually caused by an abscess around the rectal canal of the patient. The wound is slow to heal after fistula surgery and is prone to inflammation or infection. It is necessary to use potassium permanganate diluted in a fumigation bath every morning and evening under the guidance of a doctor to help relax the anal sphincter, promote local blood circulation in the anus, and to a certain extent facilitate the absorption of wound inflammation. It can also play a role in relieving pain as well as sterilizing and relieving itching, which is conducive to the healing of wounds. You should also pay attention to the daily change of medication to keep the affected area dry and clean. You also need to pay attention to the diet, not to eat irritating food to avoid causing relapse.