Health on MSN4mon
What Causes a Black Line on Your Nail (Melanonychia)?Nail melanoma most commonly affects the big toe, thumb, or index finger. One of the first signs of nail melanoma is a ...
Verywell Health on MSN1y
What Causes a Black Line on the Nail?Medically reviewed by Susan Bard, MD A black line on the nail could be normal, such as when it is just a color variation.
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