Have you ever taken off your nail polish only to notice a dark line on the nail running vertically down your finger? These black lines on fingernails may look like bruising or internal coloring - not ...

If you have noticed lines that appear like grooves or indentations running horizontally across your fingernails or toenails, you may be wondering what's going on. These are known as "Beau's lines." ...

Should you trim your cuticles? How do you cut a hangnail? Is it better to use a cardboard or crystal file? Dermatologists and a nail technician share basic nail health tips.