I get recurring pimples on my butt cheeks....no lie!! I have very nice skin on my face, but after menstruation I get some on my a$$ cheeks. I have asked the doctor, and they said it was normal, people get pimples anywhere there is skin. Don't get me wrong...my butt isn't polluted with them or anything....
They get large, almost like a boil, and very sore!!!!, sometimes it hurts when i sit. They are always in the same spots too. I would think she would send me to a dermatologist or somehting but she hasn't.

No they are not S. T. D..'s for anyone who wants to write a reply.....

ingrown hair I think. Get some one to look at it when it starts to hurt and see if there is one there.

It sounds like an ingrown hair. Do not try to get the hair out yourself. Picking at it too much will leave you with a nasty scar and/or a permenant bump.

I hope you have found relief as you posted your concern quite awhile ago. I had one of these too, last year. I knew I had something on my buttocks cheek for some time. But it never really bothered me. It didn't look like a pimple. Then all of a sudden, this thing started getting bigger and very sore and red. I couldn't sit, It hurt so bad. I thought I had some sort of cancer and was so scared to find out. I was advised to see a dermatologist who eased my mind right away. He said they happen all the time. He even had one once before. These can come from ingrown hair or whatever else could cause a pimple, but the main thing is that they can be very very deep in the skin or they can be on top of the skin like a normal pimple. He prescribed a general antibiotic for me. It did take a while for it to finally go away. I guess it was about 3 weeks time before I noticed a difference. But I don't think it would have gone away on its own. I also saw a surgeon who said if the medication didn't work they could cut it out. But he recommended antibiotics usually work best. And it did in my case, and my case seemed to be pretty bad. Good luck!