While a new dark brown streak in the nail, which is known as longitudinal melanonychia, is most commonly benign and the result of blood, a mole, or even a foreign body underneath the nail, in rare cases it can turn out to be melanoma, which is a cancer that can spread throughout the body if not removed. If you have had a dark streak for many years or have it in multiple fingers, it may simply be either genetic or related to the pigment in your skin. In that case, it is less worrisome.
However, if you have a new dark streak that has been present for more than a few months and you're not sure what it is, it is always safest to have it checked out by a dermatologist or hand surgeon.
However, if you have a new dark streak that has been present for more than a few months and you're not sure what it is, it is always safest to have it checked out by a dermatologist or hand surgeon.
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