I have a swollen red color line, that goes completely up my whole butt crack, sometimes it gets so bad it gets purple in color, it hurts to sit down or anything, feels like my butt is ripping or tearing apart in my crack, sometimes the skin will even peel off in it after swelling, the only relief I get is to keep Vaseline on it and it only gives me some relieif. This comes and goes, only in my crack, no where else, what could it be?