i Keep getting large lumps under my skin in the groin and inner thigh area, they are about the size of a 10 pence piece in diameter, sometimes larger. They tend to go very hard and round, they are sensative to touch, they will wither disperse in my skin or work up tot he surface and burst - they have blood and puss in them, these are very painful. My doctor said when i went on the pill this would halp and it did for the 1st year but they have come back and i still have no idea what is causing this or how to treat?