While showering, I discovered a nickle size lump, with what feels like a blister on the crack of my butt. Its not close enough to the anus, to think its a possible hemorrhoid. What I thought was a blister, looks more like a mole, because its darker than a regular looking blister. The stream of the shower was painful. What could this be? Should I see a doctor? It may have drained just a bit. Ive never experienced this before. Thank you.
Hi and welcome to Chat Doctor. Thanks for the query. It is hard to say what it is without seeing it but at this area we usually see colonial cysts, abscesses or folliculitis. It can also be std OD herpes infection. You should see proctologist who can then decide is surgical removal necessary or not.  Wish you good health.  Regards