Friday morning I was sitting at my desk when I felt this burning sensation in my left hand. Suddenly the middle joint of my index finger started swelling up and it was very painful. Then the middle joint turned purple and looked like it had been hit with a hammer. It's been two days now and the bruising is almost gone, but I am still mystified that this could happen while I was sitting there doing nothing. I googled "broken blood vessel in finger joint" and it seems that this happens to other people without injury or any apparent cause. Ever heard of anything like that?