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 fast-spreading cancer.

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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.