Athlete's Foot (Tinea Pedis)
Athlete’s foot (tinea pedis) is a common fungal infection of the feet, discussed in the 2024 expert panel review of dermatophytoses.
Symptoms
Itching, burning, and scaling between the toes (the most common, interdigital form), or more widespread dry scaling across the sole in a "moccasin" pattern; blistering forms also occur.
Causes and risk
Dermatophyte fungi that thrive in warm, moist environments -- locker rooms, communal showers, and sweaty shoes are classic exposures; diabetes and immunosuppression raise the risk of complications.
How it is evaluated
Diagnosis is often clinical, though KOH prep, culture, or PCR confirms the diagnosis when appearance alone is unreliable, per AAFP guidance.
Treatment
Topical antifungals (azoles, allylamines) are first-line for most cases; oral terbinafine is reserved for extensive, moccasin-type, or treatment-resistant infections, with liver function monitored during oral therapy.
When to seek care
Signs of bacterial superinfection (spreading redness, warmth, drainage) or any foot infection in someone with diabetes should be evaluated promptly, given the elevated risk of complications in that population.