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From aad.org, a report on dermatology and blisters and health clubs and exercise:

Health clubs are breeding grounds for all kinds of fungus — from swimming pool floors and diving boards to showers and locker rooms. The most common contagious fungal infection that exercise enthusiasts are prone to developing is tinea pedis, or athlete's foot. This fungus grows best in dark, moist and warm environments, making sweaty feet tucked inside running shoes perfect targets. Perhaps the most bothersome symptom of athlete's foot is the itching and burning sensation people feel on their feet. In some individuals, the skin between the toes peels, cracks and scales, while others may experience redness, scaling or dryness on the soles and along the sides of the feet. Some people who develop athlete's foot also may be at risk for toenail fungus, which can be difficult to treat without dermatologic care. “The best defense against athlete's foot is to never go barefoot in a health club,” advised Dr. Adams. “Wear shoes, socks, sandals or aquatic shoes at all times.”