Black toenails are usually the result of toenail injury. However, there are other things that can cause a black toenail, including fungal or bacterial infections. Most cases of black toenails aren’t ...

Most bruised toenails due to minor injury can be treated at home. Ice and bandages can help, but medical treatment may be needed for a large or painful area. In rare instances, a dark line under 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. Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a ...