The patient has to go through the pain of changing the medicine after the fistula surgery, although the patient has to go through the pain of changing the medicine as soon as possible. The surgical wound is open, and the new granulation tissue is slowly filled in through postoperative dressing changes. The daily change of medication after anal fistula surgery can achieve the following effects: 1. remove secretions and feces from the surgical wound to keep the wound clean and prevent contamination and thus infection; 2. the medication gauze placed in the wound during the change of medication can not only drain the wound, but also protect the wound; 3. the change of medication can use some drugs that promote the growth of the wound such as Jiuhua cream, rehabilitation new liquid, etc.; 4. unhealthy granulation tissue handled to promote wound healing; 5. By filling the gauze strips, it can ensure wound healing from the base and avoid bridge healing; 6. For patients with surgical hang-ups, the elasticity of the rubber band should also be checked and tightened if necessary. In terms of the number of drug changes many patients ask, is it good to change the number of drug changes? In principle, it is once a day after the stool, early wounds depending on the amount of secretions, but Chinese medicine also has “simmering pus long flesh”, that is, secretions on the healing of the wound has a catalytic effect, so the number of drug changes is not the more the better.