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 ...

Michelle Tagliamonte, 58, was getting a manicure when she noticed the black lines on her thumb, which signaled the start of a ...

Michelle Tagliamonte, 58, spotted faint black lines on the nail of her her right thumb while getting a manicure in September last year. But when the marks hadn't grown out by her next nail session ...

An Ohio mother-of-two made a crucial health discovery after spotting black lines on her thumb during a routine nail appointment, as reported by Daily Mail. Ohio woman noticed black lines on her ...

A black line on the nail could be normal, such as when it is just a color variation. Other possible causes range from injury to certain medications for conditions like human immunodeficiency virus ...

The black lines (left) on Michelle Tagliamonte's thumb were a sign of cancer.

this black line in my nail was coming from inside the growth plate down from inside my nail.” “The melanoma was in the growth plate [in my thumb] down to my first knuckle,” explains Tagliamonte.