A nail fungus is actually an opportunistic infection, which means, it is everywhere, there just has to be an impetus that affects the toenail.  So if it is in the environment, even though you treat the nail, it may become re-infected if the fungus is present on the skin. Keeping your feet dry, especially between the toes, will prevent the fungus from "hanging around" and help you get rid of the fungal nail infection faster.  At Prairie Path Foot and Ankle Clinic, we have several products including Fungifoam for the skin.  Make an appointment with one of our doctors for a thorough evaluation to help treat your nail fungus and prevent it form spreading.