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 it, and when you should call your doctor.

Subungual melanoma is a rare form of skin cancer ... with other conditions like bacterial and fungal infections or nail injury. In addition to a dark band of color on a nail, warning signs ...

An increased risk of both invasive and superficial fungal infections was observed among patients who received TNF-α inhibitors for various conditions.