Athlete's foot is caused by a microscopic fungus that spreads easily in moist areas like showers. Anyone can get athlete's foot but those who spend more time in moist environments like pools are more prone to it. The signs and symptoms include scaling, flaking, and itching skin on the feet, and can be diagnosed visually or via a potassium hydroxide test. There are different categories of athlete's foot that can be acute, chronic, or recurrent. Treatment involves keeping feet clean and dry, wearing clean socks and shoes, and using antifungal medications or soaks for several weeks.