The stitches are usually removed in 7-10 days, but some post-operative fistula patients have to defecate every day and there are still a lot of bacteria in the feces, which may cause infection of the fistula incision. If there is an accumulation of pus in the incision, the stitches should be removed early for drainage, the time is not fixed, it may be 3-4 days after surgery, or 4-5 days, depending on the situation. However, if there is no accumulation of pus or infection in the incision, the stitches can be removed 7-10 days after surgery. Patients usually need to develop good bowel habits and pay attention to the cleanliness and disinfection of the incision to prevent the delayed healing of the incision due to infection inside the incision.