There are more reasons for not wiping the buttocks clean. The common reasons may be caused by external hemorrhoids, perianal infections, intestinal polyps or tumors and other diseases. 1. external hemorrhoids: if the butt wipe is not clean, consider the appearance of external hemorrhoids. Most of the external hemorrhoids are around the anus, which can form a mass-like tissue, resulting in deeper anal folds. In the wiping process, due to the localized unevenness of the anus, the situation of not wiping clean is manifested. 2. Perianal infection: due to perianal infectious diseases, such as perianal abscess and anal fistula. The presence of purulent secretions can also lead to the situation of not wiping the ass clean. 3. Intestinal polyps or tumors: you also need to exclude the presence of intestinal polyps or intestinal tumors and other factors, if there are hyperplastic polyps or tumors in the intestinal tract, which can lead to intestinal fluid spillage, showing the situation of wiping the buttocks wipe not clean. In addition to the above reasons, there may be other causes, so it is recommended that patients should go to the hospital in a timely manner, after a clear diagnosis, follow the doctor’s instructions for targeted treatment.