If you find yourself with athlete's foot, don't let it spread to jock itch. To help prevent it, give your groin first priority: After showing, dry your groin before drying your feet (don't let your towel pass it around).
Getting rid of fungal infections is a tricky business. Treatments can be time-consuming and often need to be continued after the symptoms have disappeared -- and chances of re-infection are high. Fungi overgrowth can cause infections in skin and nails, the vagina, the mouth and the sinuses. These should all be treated by your doctor. However, you can usually treat athlete's foot at home with nonprescription fungal medicines (which come in a variety of forms like cream, spray, gel and powders).