Dark Lines In Nails. These thin red lines run vertically down the nail, and basically look like splinters, from which they draw their name. The indentations can appear when growth at the area under the cuticle is interrupted by injury or severe illness.

What causes dark lines in fingernails? Nails Journal
What causes dark lines in fingernails? Nails Journal from nailsjournal.com

A biopsy should be performed in an adult if the cause of longitudinal melanonychia is suspicious for melanoma. They are most commonly known as longitudinal striations or bands. Those vertical black lines on your nails are called splinter hemorrhages.

Red Or Brown Streaks May Be Splinter Hemorrhages.


It can happen if you have a low supply of protein, calcium, zinc, and vitamin a. Pitted brown spots in fingernails may indicate a skin and joint disorder called psoriasis. Schlessinger adds, “the colors can be anything due to nail thickness and different areas where moles can originate.

Trauma Is One Of The Most Common Causes Of Splinter Hemorrhages.


If the stripe is very dark if the border of the stripe is blurred if there are changes in an existing stripe if the patient has a family history of cancer A biopsy should be performed in an adult if the cause of longitudinal melanonychia is suspicious for melanoma. It can occur due to blood vessel inflammation or capillary damage and affect one or multiple nails.

Black Stripes Down 1 Nail May Be Subungual Hematoma.


These nails look very smooth and rounded. Vertical lines on lines, vitamin b deficiency white lines on nails fingernails can indicate health problems by their appearance. The most common nails to see this dark stripe under is the thumb, big toe, and index finger.

The Blood Traces May Seem Brownish Or Reddish In Addition To Blackish.


The indentations can appear when growth at the area under the cuticle is interrupted by injury or severe illness. “the most usual causes for nail issues, however, are trauma and hereditary issues. Although most cases of dark nails are benign melanin in the nail root, a small percentage may represent melanoma, a potentially fatal cancer.

Conditions Associated With Beau's Lines Include Uncontrolled Diabetes And Peripheral Vascular Disease, As Well As Illnesses Associated With A High Fever, Such As Scarlet Fever, Measles, Mumps And Pneumonia.


A dark line running along the nail should always be investigated urgently. Melanonychia can present in individuals of all ages, including children, and affects both sexes equally. Most commonly, dark stripes down a person’s nail are due to a symptom known as linear melanonychia.

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