A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed ...

Have you ever taken off your nail polish only to notice a dark line on the nail running vertically down your finger? These ...

When doctors examine patients, they often look beyond the presenting symptoms to gather additional diagnostic information.

It presents as a darker patch of discoloration of the skin. It can also occur in the nail and appear as a wide, dark streak on the nail. It is important to note, however, that not all dark streaks ...

Dark blue nails are classic and look gorgeous on everyone, but how you wear them is up to you. Check out 30 dark blue manis ...