My Girlfriend Had Someone Shoot Her With Meth And They

My girlfriend had someone shoot her with meth and they missed and is un sure of what antibiotics would be helpful in making sure it does not abscess, there is a knot where they did it and is red and just a little warm an a little sore. It's been about 2 days since they did it. Can you tell me some antibiotics she can take and anything else she can do or not do to help it? She is not going to do this again she says.