I had a huge raised red spot pop up on my ankle where I accidentally walked into some bob wire which pierced my skin. The bob wire wasn't rusted and even if it had been, I've had my tetanus shot. But it's raised and red and immensely sore. It has not came to a head yet and I'm not seeing any yellow pus yet, but I have about 5- 500 mg amoxicillin left from a previous sickness and thought maybe I could start taking them to hopefully prevent possible Staph. I've had it once before and it looks similar to how it started out in the beginning. Thanks.