When it comes to annoying skincare woes like butt acne or keratosis pilaris (those little bumps you sometimes get on the backs of your arms), dark spots and hyperpigmentation rank right up there. And ...

For years, many people have believed that deodorants are the main reason behind dark underarms. It's one of those beauty remarks that has been passed down through friends, family, and the internet.

"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 ...