Athlete's Foot and fungal nails are the most common fungal problems with feet. A fungus is a common mold that thrives in dark, warm moist areas. On the feet, it can grow on and between toes, as well as on soles and toenails. Fungal problems can be a result of the environment (socks, shoes, heat, and humidity) or weakened immunity from disorders such as diabetes.

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Chronic fungal infections are most common in adults, while acute fungal infections are seen more often in children.