These infections are caused by a common fungus, a type of microscopic organism. Symptoms can be an itchy, red, rash in the groin or on the bottoms of your feet. They especially like moist, warm, dark areas to grow.

Athlete’s foot (tinea pedis)

Wear flip-flops in public showers, locker rooms, and around swimming pools or Jacuzzis. Also change your socks and shoes often and let your feet air dry when you are at home, instead of keeping them in tennis shoes all day long. Cotton underwear can also help prevent jock itch.

More info…

Athlete’s Foot, Jock Itch and Ringworm
Info from the Cleveland Clinic Information Center.