Health on MSN4mon
What Causes a Black Line on Your Nail (Melanonychia)?A black line can also stretch horizontally across the nail (horizontal melanonychia), though this is rare. Depending on the ...
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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