Does your rectum blot out? My father and my father's employee both experienced that before. If that's the case immediately go to the doctor and he/she will squeeze some sort of muscles that holds the rectum inside
There are several causes. Hemorrhoids or fissures are common causes. Clean with wipes after every movement. Witch hazel is what they put in many hemorrhoid treatments to calm down the swelling. For fissures, clean the area and then apply petroleum jelly.