I was in a head on car accident last week. I suffered bruises on my face and banged my leg against my keys but other than that I was ok. I went to the ER and they said my head was ok. However, since that time my right leg, where I banged it against my keys, has partly gone numb. The area right below my knee...maybe 6x4 inches around is numb. I dont have any problems with movement. There is a little pain around the area. Any idea what could be causing this? A pinched nerve maybe? My leg is also a little swollen.