I Had A Friend Who Shot Up Meth In The

I had a friend who shot up meth in the back of the leg in the bend of the knee. It burned signaling a miss but put some in first. Later that evening it hurt so bad that he couldn't put pressure on it to walk. He can walk again now wit pain n slight limp. But it is red all the way from knee almost half way to ankle n it's slightly warm where it's red n hurts there. Its still swollen