A lot of people think white stuff is candida and it usually isn’t. Some people pass incredible “blooms” with enemas. But it’s likely mucous. I’ve heard that when that mucous starts exiting the system, it can leave some exposed tissue. It’ll heal, though it never hurts to get something checked out. Does there seem to be a lot of blood? If there isn’t much, I wouldn’t worry too much. Is it red or is it black? Black indicates a problem much further up the digestive system, red something near the end.