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A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed. It can be a normal color variation, especially in people with darker ...

Nail ridges are grooves or raised lines that form on the nail plate and may run horizontally or vertically. They can vary in severity, from barely noticeable to quite pronounced. While some ridges ...

causing white lines to appear across the nail. These medications can also cause symptoms like slow nail growth, nail thinning, and brittleness. How to treat it: There is no treatment for drug ...

But sometimes, they can appear yellow, green, blue, purple, or black ... at some of the most likely causes of your toenail discoloration and how they’re treated. Nail fungus, also called ...