2 weeks ago i slammed the back of my hand on a door frame accidently,i had swelling and bruising which has virtualy gone,but inbetween and near my index finger and forefinger ive got a hard erased lump which hurts to touch,i can fist wih my hand but it hurts my index finger,ive been for a xray but heard nothing yet,any idea what it could be.. thank you