Why does my anus hurt?

When I shower, and amcleaning "up there" I feel what feels like a bump aboput the size of a quarter, maybe a little bigger. It hurts alot. Mostly if a Sit down alot, or after a BM. I was wondering is this a Hemmoriod(SP?)? or is this beacuase I have just Lost 110 pounds in six months, and my bum is just not built up back there? Any insight is appreciated. I know it is disgusting, but I am almost ready to go to the doctor with this M. Bare Assing situation.

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