A doctor may diagnose athlete’s foot by the symptoms alone or may order a skin test if they aren’t sure if a fungal infection is causing your symptoms.
A skin lesion potassium hydroxide (KOH) exam is the most common test for athlete’s foot. A doctor scrapes off a small area of infected skin and places it in potassium hydroxide (KOH). The KOH destroys normal cells and leaves the fungal cells untouched so they are easy to see under a microscope.