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What Causes a Black Line on Your Nail (Melanonychia)?A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed ...
A smartphone camera image was magnified on the screen, visualizing the varying longitudinal pigmentation (melanonychia striata) (b) and the “Micro-Hutchinson-Sign” at the proximal nail wall (c).
A smartphone camera image was magnified on the screen, visualizing the varying longitudinal pigmentation (melanonychia striata) (b) and the “Micro-Hutchinson-Sign” at the proximal nail wall (c).
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