Athlete's Foot Athlete’s foot, also called tinea pedis, is a common fungal infection that affects the skin of the feet. It often starts between the toes but can also spread to the soles, sides, or tops of the feet. The fungus grows best in warm, moist areas, which is why sweaty socks, tight shoes, locker rooms, public showers, and pool areas can increase the risk. Athlete’s foot is usually not dangerous, but it can be uncomfortable, itchy, and contagious. If untreated, it may