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It could be an anal fissure, one fissure and you hole sweat like crazy, the reason of a anal fissure could be an enema or something like that. Never put the shower attachment in your ass anon, i removed the head of it and put the hose into my ass because one day i found some shit stains on my underwear, the result was catastrophic, for months an incredible volume of sweat every, and some times even blood comes from there, never put that thing in your ass anon, it's not a good idea.