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  1. What's Causing That Black Line on Your Nail - Healthline

  2. What is Longitudinal Ridging? - News-Medical.net

  3. Melanonychia: What It Is, Causes, and More - Healthline

  4. What Is Melanonychia? What Causes It and How It's Treated - WebMD

  5. Melanonychia - DermNet

  6. Black Line on Nail: Causes, Treatment, and More - Verywell Health

  7. Is the Black Line on Your Nail Normal or Melanoma? How To tell - TODAY

  8. Black line on the nail: Causes, treatments, and pictures

  9. What Causes Those Vertical Black Lines on Nails? - POPSUGAR

  10. Black Line on Nails: Causes, Treatment, and More - Healthgrades