Hello. I was at karate training last night and I punched my oponent. My left, index knuckle (the big one that joins the finger to the palm) made contact with my oponent s elbow. It was immediately painful. Within a few minutes it was swollen and tender to touch. This morning, it has developed bruising, is still swollen, tender to the touch and is slightly numb. I can make a fist, but it is painful to do so. Is it just a bruise from making contact, or could I have done some more serious damage?