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PS on MSN.com · Mar 7, 2025

What Causes Those Black Lines on Nails? Experts Explain

"The most common dark streaks that occur in nails develop as a result of ... Serious conditions that can cause a splinter hemorrhage include bacterial endocarditis, vasculitis, systemic diseases ...
Icon for www.msn.comMSN · Dec 11, 2024

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 ... as a dark verticle line (known as a splinter hemorrhage). Splinter hemorrhages typically ...