A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed. It can be a normal color variation, especially in people with darker ...

These black lines on fingernails may look like bruising or internal coloring - not like you just accidentally created an edgy ...

She explains that the appearance of the brown band on a nail "is something for which you should always consult a dermatologist" about. It is called longitudinal melanonychia and can have multiple ...

In addition to onychorrhexis, several other types of lines can develop on nails and indicate different health issues. These can include leukonychia striata, longitudinal melanonychia, longitudinal ...