I'm no expert on anything like this, but this does somewhat sound like an experience one of my friends had. He seemed to have the same thing wrong with him. He always said his ass hurt like hell, it would bleed, and it felt really large. I guess his was more in the shape of a ring, so I couldn't tell you if this is the same thing you have. But he went to the doctor and found out that it was a boil!!! So honestly, I would go to the doc and get everything straightened out. Just my .02.
Thomps
Thomps