Black Vertical Line On Nail. A black discoloration that's a straight vertical line or streak and grows from the nail bed, usually on a single nail, is not something to ignore. They are very faint, not dark, dark like those described for melanoma, and they are not splinter hemorrhages.
However, they are usually harmless. Its like splinters under my nails. About 75 percent of cases involve the big toe or the thumb. A dark, vertical stripe on a woman's nail turned out to be nail melanoma.
For example, splinter hemorrhages are.
I have no idea what it is and was wondering if anyone could help me. Though they're not associated with any serious condition, in some cases it when you dig deep into causes of black or brown discoloration of nails, you'll find various internal and external factors as culprit. A woman has shared a warning in which she claims that finding a black line down your nail could be a sign of cancer. Dark lines on nails can be a result of finger trauma.
