Longitudinal melanonychia presents a difficult clinical challenge because subungual melanoma must always be included in the differential diagnosis and because the cause of longitudinal ...

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).