Hi, I stepped in a nail yesterday about 2pm. I cleaned the area with peroxide and applied Neosporin and a bandaid. I did have a Tetanus shot last year in Jan. 2011. This morning when I got up, the area around the puncture wound is swollen, red and hurts to walk on it. I am estimating the nail went in my foot about a 1/2 to 3/4 inch. I do have a suppressed immune system and don't have a vehicle to get to my family Dr. Could this be an internal infection starting in my foot ?