The fungal problems seen most often are athlete’s foot and fungal nails. 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 environment (socks, shoes, heat, and humidity) or weakened immunity (diseases such as diabetes). Chronic fungal infections are most common in adults, while acute fungal infections are seen more often in children.
Note: Shoes made of synthetics such as plastic allow fungus to breed by trapping heat and moisture around your feet.