Ringworm is a common fungal skin infection that plagues wrestlers, martial artists, and athletes. The infection appears as a circular, red, itchy rash. It spreads through direct contact with an infected person, gym mat, or other surface. Infected skin might feel scaly, raised, and itchy—this will typically last until it’s treated.  Ringworm is caused by the same fungus that causes athlete’s foot, jock itch, and fungal toenail infections. While it’s treatable by over-the-counter creams, it takes at least a week before you’re cleared to resume training. This uncomfortable skin infection can be prevented in many cases through the use of antifungal products, proper hygiene, and sterilization of equipment and mats.