A few days ago, a soreness from sitting down occurred. I didn t check in a mirror until today, but I could feel the soreness in the upper part of my buttocks, closest to the back where the cheeks begin, and it was wet and I felt dead skin stuck in there. When I examined, I found two identical circles on both sides of my buttocks crack lining, and I have no idea what it is. I am a generally clean, 20 year old healthy male. Any suggestions?