question: My son has a small lump on the left side of his intergluteal cleft area that is very painful to the touch. It does not hurt when he is standing up only when he sits or lays on his back or if light pessure is applied to the area. It seems more swollen by the end of the day after he returns from school. Of course he has been sitting at the desks in class pretty much all day. There is no skin dimpling only slight redness when inflamed.Could it be an infected cyst