CausesBy Mayo Clinic staff
Athlete's foot is closely related to other fungal infections, including ringworm and jock itch. A group of mold-like fungi called dermatophytes causes these infections. These microscopic organisms are normal inhabitants of your skin, and their growth stays in check as long as your skin is clean and dry. However, dematophytes thrive in damp, close environments.
Athlete's foot thrives in thick, tight shoes that squeeze the toes together and create warm, moist areas between them. Damp socks and shoes and warm, humid conditions also favor the organisms' growth. Plastic shoes, in particular, provide a welcoming environment for fungal growth and infection.
Athlete's foot is contagious and can be spread by contact with an infected person or with contact with contaminated surfaces, such as towels, floors and shoes.
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