I have a bump on the surface of the inside of my left buttock. It s not really noticeable as a lump, but it s firm to the touch and stings a bit when touched. It s low on the cheek, and the other day when I was wiping, a lot of bright red blood came off on the tissue paper. Sometimes the blood seemed kind of thick and puss-like, and sometimes it was just pure blood. Once I was done wiping, it seemed to stop bleeding . I can still feel it sting a little when I walk, though.