Medically reviewed by Katlein Franca, MD Toenail fungus, or onychomycosis, is a nail infection that can make your toenails thicker, change color, or break apart. It affects about one in 10 people and ...

From trauma to a toenail fungus, there are many reasons why you may have a black toenail. Here's what it means, how to treat ...

Rare, deadly, and often missed, some skin cancers develop in areas that rarely see the sun. Scientists are still learning about them, but here's what we know.