Pimple on butt problem, what should I do?

I have had a pimple on my butt that disappears and comes back from time to time. Today I accidentally "opened" it when I sat a bit hard on the chair... It did hurt, EW. I can't see it, only at the mirror. It had blood so I cleaned up... I know this is friggin weird but what should I do? Just do nothing
Pimple on butt problem, what should I do?
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