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Athlete's foot is a common infection caused by the tinea fungus. It is not serious. Symptoms include itching, burning and cracked, scaly skin between your toes. Tinea grows best in damp, dark and warm places, which is why it often develops between your toes. It can spread to your toenails, as well, making them thick and crumbly.
Sources
MedlinePlus - Athlete's Foot