I [HEART] lidocaine

So I've had problems with lidocaine before (the stuff they use to numb your skin before they put stitches in), mostly that my body seems to metabolize it so fast and all the numbness wears off before they can finish stitching or whatever, but this is a new one... The stitches were on my back, but for some reason my right eye started swelling shut. I don't get lidocaine anymore..