Subungual onychomycosis is the most common type of toenail fungus and affects the nail bed and underside of the nail. White superficial onychomycosis causes white spots and flaky patches on the ...

If you're a runner, you know that black toenails are common—but that doesn't mean you have to put up with them. Black toenails are common among marathoners and other serious runners, but you don't ...

"The most common issue is nail fungus (onychomycosis)," says Dr. McEneaney. "This is typically the same fungus that causes athlete's foot. It's very transmittable and very easy to pick up walking ...

A badge of honour for ultra-runners, black toenails are caused by blood pooling beneath the nail. The most likely cause? Very long runs in ill-fitting shoes. "There should be 1cm between the end of ...