"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When it comes to annoying skincare woes like butt acne or keratosis pilaris (those little bumps you ...

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 ...

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 ...