Athlete's foot is an infection of the feet caused by fungus. The medical term is tinea pedis, or ringworm of the foot.
Tinea pedis; Fungal infection - feet; Tinea of the foot; Infection - fungal - feet; Ringworm - foot
Causes, incidence, and risk factors
Athlete's foot occurs when a certain fungus grows on the skin of your feet. The same fungus may also grow on the heels, palms, and between the fingers.
Athlete's foot is the most common type of tinea fungal infection. The fungus thrives in warm, moist areas. Your risk for getting athlete's foot increases if you:
- Wear closed shoes, especially if they are plastic-lined
- Keep your feet wet for long periods
- Sweat a lot
- Develop a minor skin or nail injury
Athlete's foot is easily spread. It can be passed through direct contact or contact with items such as shoes, stockings, and shower or pool surfaces.
The most common symptom is cracked, flaking, peeling skin between the toes or side of the foot. Other symptoms can include:
- Red and itchy skin
- Burning or stinging pain
- Blisters that ooze or get crusty
If the fungus spreads to your nails, they can become discolored, thick, and even crumble.
Athlete's foot may occur at the same time as other fungal skin infections such as jock itch.
Signs and tests
Your health care provider can diagnose Athlete's foot simply by looking at your skin. If tests are needed, they may include:
- A simple office test called a KOH exam
- Skin culture
Over-the-counter antifungal powders or creams can help control the infection:
- These contain medicine such as miconazole, clotrimazole, terbinafine or tolnaftate.
- Keep using the medicine for 1 to 2 weeks after the infection has cleared to prevent it from returning.
- Keep your feet clean and dry, especially between your toes.
- Wash your feet thoroughly with soap and water and dry the area carefully and completely. Try to do this at least twice a day.
- To widen and keep the web space (area between the toes) dry, use lamb's wool. This can be bought at a drugstore.
- Wear clean cotton socks. Change your socks and shoes as often as needed to keep your feet dry.
- Wear sandals or flip-flops at a public shower or pool.
- Use antifungal or drying powders to prevent athlete's foot if you tend to get it often, or you frequent places where athlete's foot fungus is common (like public showers).
- Wear shoes that are well-ventilated and made of natural material such as leather. It may help to alternate shoes each day, so they can completely dry between wearings. Do not wear plastic-lined shoes.
If athlete's foot does not get better in 2 to 4 weeks with self-care, or frequently returns, see your health care provider. Your provider may prescribe:
- Medicines to take by mouth
- Antibiotics to treat bacterial infections that occur from scratching
Athlete's foot almost always responds well to self-care, although it may come back. Long-term medicine and preventive measures may be needed.
Calling your health care provider
Call your doctor right away if:
- Your foot is swollen and warm to the touch, especially if there are red streaks. These are signs of a possible bacterial infection. Other signs include pus, drainage, and fever.
- You have diabetes or a weakened immune system and develop athlete's foot.
- Athlete's foot symptoms do not go away within 2 to 4 weeks of self-care treatments.
Elewski BE, Hughey LC, Sobera JO, Hay R. Fungal diseases. In: Bolognia JL, Jorizzo JL, Schaffer JV, eds. Dermatology. 3rd ed. Philadelphia, Pa.: Elsevier Saunders; 2012:chap 77.
Habif TP. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Philadelphia, Pa.: Elsevier Mosby; 2009:chap 13
Reviewed by:Kevin Berman, MD, PhD, Associate, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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