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Athlete's Foot

Written By: Kirk A. Koepsel, D.P.M. Editor, PodiatryNetwork.com

Description

Athlete's foot is caused by a fungal infection of the skin on the foot. The majority of these infections are caused by one of three fungal agents called dermatophytes. Athlete's foot is by far the most common fungal infection of the skin. The infection can be either acute or chronic. The recurrent form of the disease is often associated with fungal-infected toenails. The acute form of the infection most often presents with moist, scaling between the toes with occasional small blisters and/or fissures. As the blistering breaks, the infection spreads and can involve large areas of the skin on the foot. The burning and itching that accompany the blisters may cause great discomfort that can be relieved by opening and draining the blisters or applying cool water compresses. The infection can also occur as isolated circular lesions on the bottom or top of the foot. As the skin breaks down from the fungal infection, a secondary bacterial infection can ensue.

Diagnosis

The diagnosis of tenia pedis is generally made based upon the clinical presentation. A definitive diagnosis is made by taking a scraping of the skin and culturing it. It may take up to three weeks for the culture to grow the fungus. In some instances the culture may present a false negative result because the skin scraping was inadequate. Some doctors may perform a KOH prep of a skin scraping. This is examined under a microscope and may reveal elements that can make the diagnosis.

Treatment

Treatment should be directed at controlling the fungal infection and treating any secondary bacterial infection with oral antibiotics. Soaking the feet in Epsom salts and warm water is helpful. Wearing sandals to reduce moisture accumulation and heat generated by closed shoes will also help in the control and spread of the infection. Other conditions that mimic acute athlete's foot are contact dermatitis and pustular psoriasis.

The chronic form of athletes foot is a relatively noninflamatory type of infection. It is characterized by a dull redness to the skin and pronounced scaling. It may involve the entire bottom of the foot giving a "moccasin" appearance. It generally does not itch or result in the formation of blisters. This form of the disease frequently has an associated fungal infection of the toenails. There are good topical and oral medications available for the treatment of this condition. There are some less common causes of dry scaling skin on the feet.

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