Ringworm (a skin infection caused by a fungus, not a worm) Ringworm can affect skin on your body, scalp, groin area (jock itch), or feet (athlete's foot) Symptoms: Itchy, red, raised, scaly patches that may blister and ooze. The patches often have sharply-defined edges. They are often redder around the outside with normal skin tone in the center. This may create the appearance of a ring. When your scalp or beard is infected, you will have bald patches. If nails are infected, they become discolored, thick, and even crumble. Treatment: Ringworm usually responds well to self-care within 4 weeks without having to see a doctor. Keep your skin clean and dry. Apply over-the-counter antifungal or drying powders, lotions, or creams. Those that contain miconazole, clotrimazole are often effective. Wash sheets and nightclothes every day while infected. Prevention: Keep your skin and feet clean and dry. Do not share clothing, towels, hairbrushes, or other personal care items. Such items should be thoroughly cleaned and dried after use. Wear sandals or shoes at gyms, lockers, and pools.