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A small black line that forms vertically underneath your nail may be a splinter hemorrhage, while horizontal lines may be melanonychia. These may be harmless or a sign of a more serious...
Melanonychia is the most common cause of a black line on a nail. This condition is characterized by black or brown discoloration of the nail plate. It can affect just one nail or multiple nails on the fingers and toes. It accounts for nearly half of all cases of nail discoloration.
A look at a black line on the nail, a common change that can happen due to a range of causes. Included is detail on the diagnosis and when to see a doctor.
Beau's lines. Beau's lines are grooves that run across the nails. They can appear when nail growth temporarily stops due to injury or illness. Beau's lines may be caused by: Infections. Diabetes that is not well controlled. Conditions in which narrowed blood vessels lower blood flow to the arms and legs.
Having a dark line on your fingernails or toenails is called melanonychia. The lines are brown or black and usually look like a stripe that begins at the bottom of your nail bed and continues...
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...
Longitudinal ridging, which is clinically known as onychorrhexis, occurs on the nails and may appear as vertical striations or lines that originate from the base of the fingernail and...
Melanonychia is a brown or black color in your nail. It can affect your fingernails or toenails. It can be in one nail, a few nails, or all of your nails. Melanonychia can have many different...
Brown lines or dark stripes on the length of your fingernails or toenails (longitudinal melanonychia) have many causes—from vitamin deficiencies to cancer. Learn more.
Horizontal ridges or dents in your nails are usually due to a condition called Beau’s lines. These dents may happen when something interrupts your nail growth. Possible causes include: Chemotherapy. Damage from using artificial or acrylic nails or getting gel manicures for long periods.