hi I have a small lump on the outer wall of my anus next to, but not on the sphincter o the left side of it. What could it be? and, What can I do about it? It is not a hemorrhoid, I think, I had it there for a while and it seems that I did something that cut it or something because it feels like it s open, it does not hurt, it feels more like a sting, from a small cut.