I have a very sensitive lump on my groin, in the pubic hair area (not on my leg). It s about the size of a half dollar, feels like a small ball inside, very sensitive, and filled with puss and blood. This happens every few weeks and switches sides, and sometimes on my inner thigh instead. It hurts too much too squeeze and pop rightnow, and I can barely walk. But, usually when it does pop, it heals up within a few days. Do you know what this could be???