The process of shedding anal fistula dermatomes takes about 10 to 15 days, and the exact time of shedding varies with each patient’s condition. Anal fistula is a common disease in the anorectal department, and patients will have symptoms such as repeated pus flow, sticky discharge, moist and itchy anus, and anal pain. Anal fistula hanging line therapy belongs to the common treatment methods, surgery can be used to cut the fistula with a medical line or rubber band; rubber band or medical line once loose, need to go to the hospital to tighten the line, to maintain the original tightness, until the fistula more and more cut smaller and smaller, the line completely fall off. Each patient’s condition is different, generally speaking, 10 to 15 days or so, the skin band can fall off, the end of the treatment, wait until the wound epidermal cover will be completely healed. If the patient’s fistula is larger, the number of times the thread needs to be tightened will increase, and the time for the rubber band to come off will also increase, and it will probably take about 20 days. In summary, each anal fistula patients rubber band off time is different, patients can be more observation, monitoring the recovery, regular review, if necessary, consult a doctor.