If your athlete's foot recurs frequently, your doctor may recommend that you use a medication continuously.

CNN: Athlete's foot

Barefoot runners risk getting athlete's foot and plantar warts, says Stephen Morse, a professor of epidemiology at Columbia University's Mailman School of Public Health.

WSJ: Barefoot Jocks Keep Gym Members on Their Toes

It found that 26% of the sample had Tinea pedis, better known as athlete's foot, while 30% had Onchomycosis, an infection that causes toenails to become thickened, discoloured and distorted.

ECONOMIST: Fancy footwork