Hannah Lee is a celebrity manicurist. Splinter hemorrhage (nail trauma) Fungal infection Melanonychia Melanoma Not all marks ...

The majority of nail discoloration is caused by infections ... Do you see thin red or brown lines? They’re called splinter hemorrhages. They usually come from trauma to your nails or a fungal ...

A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed ...