Liam Carter
Black nail beds can be caused by a number of factors, including injury, bacterial infection, and autoimmune conditions. In this article, we will explore the possible causes of black nail beds and provide information on when to seek medical attention. We will also discuss the potential treatments available and offer advice on how to prevent this condition from occurring.
| Characteristics | Values |
|---|---|
| Name | Melanonychia |
| Appearance | A black or brown line running vertically or horizontally along the nail bed |
| Causes | Overproduction of melanin, medications, health conditions (e.g. HIV, endocarditis), trauma, splinter haemorrhage, psoriasis |
| Action | Seek medical attention, especially if changes occur suddenly |
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What You'll Learn
Endocarditis
Black nail beds can be caused by a number of factors. One cause is melanonychia, which occurs when the skin overproduces melanin or pigment-producing cells (melanocytes). This can be caused by HIV and antiretroviral therapy, as well as other medications and health conditions. Melanonychia can present as longitudinal melanonychia, which is a black or brown line running vertically along the nail bed in the direction of nail growth. It can also present as total melanonychia, which involves black or brown discolouration across the entire nail bed and may occur in individuals with dark skin pigmentation. Finally, it can present as transverse melanonychia, which appears as a black or brown band running horizontally across the nail bed.
Another cause of black nail beds is endocarditis, a bacterial infection in the heart. When black lines appear on multiple nails, it tends to point to a systemic (body-wide) cause rather than an injury. Endocarditis can cause black lines on the nails due to damaged blood vessels.
Splinter haemorrhage is another potential cause of black nail beds. This occurs when the nail experiences trauma, causing tiny blood vessels beneath it to break and bleed. This results in a thin, dark line that runs vertically along the nail. Common causes include hitting the nail, prolonged pressure, or habits like nail biting. As many as 80% of people with psoriasis have it on their nails.
If you notice changes in your nails, especially without an obvious cause, it is important to see a healthcare provider. Although gradual changes are often more harmless than sudden ones, a black line on your nail with no clear reason should still be checked. If the change happens suddenly, seek medical attention right away.
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Melanonychia
There are three types of melanonychia: longitudinal, total, and transverse. Longitudinal melanonychia presents as a black or brown line running vertically along the nail bed, in the direction of nail growth. Total melanonychia involves black or brown discolouration across the entire nail bed and may occur in individuals with dark skin pigmentation. Transverse melanonychia appears as a black or brown band running horizontally across the nail bed.
In addition to melanonychia, black lines on the nail can also be caused by other factors such as trauma, splinter haemorrhage, or psoriasis. Trauma to the nail, such as hitting it or prolonged pressure, can cause tiny blood vessels beneath the nail to break and bleed, resulting in a thin, dark line that runs vertically along the nail. Psoriasis, an autoimmune skin condition, can also cause nail changes, including splitting, lifting away from the nail bed, itching, and thickening.
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Trauma
Black nail beds can be caused by trauma, such as hitting the nail, prolonged pressure, or nail biting. This can cause a splinter haemorrhage, where tiny blood vessels beneath the nail break and bleed, resulting in a thin, dark line that runs vertically along the nail bed. This is known as longitudinal melanonychia.
Melanonychia occurs when the skin overproduces melanin or pigment-producing cells (melanocytes). It can present as longitudinal melanonychia, total melanonychia, or transverse melanonychia. Total melanonychia involves black or brown discolouration across the entire nail bed and may occur in individuals with dark skin pigmentation. Transverse melanonychia appears as a black or brown band running horizontally across the nail bed.
If you notice changes in your nails, especially without an obvious cause, it is important to see a healthcare provider. Gradual changes are often more harmless than sudden ones, but a black line on your nail with no clear reason should still be checked. If the change happens suddenly, seek medical attention right away.
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Psoriasis
Black nail beds can be caused by melanonychia, which is when the skin overproduces melanin or pigment-producing cells (melanocytes). This can be caused by HIV and antiretroviral therapy, or can occur naturally in people with a dark complexion. Black lines on the nail can also be caused by endocarditis, a bacterial infection in the heart, or by trauma to the nail, such as hitting it or nail biting.
Nail psoriasis can cause nail discoloration, with the colour changing to yellow or yellow-red, and eventually turning a dark colour if bacteria gets into the space under the nail and causes an infection. The surface of the nail can also develop small pits, and the nail can become detached from the underlying nail bed, leaving an empty space under the nail. This separation is called onycholysis.
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HIV
Black nail beds can be caused by a number of factors, including HIV.
It is important to note that black lines on the nails can also be caused by other factors, such as endocarditis, a bacterial infection in the heart, or trauma to the nail, such as a splinter hemorrhage. If you notice any changes in your nails, especially without an obvious cause, it is recommended to consult a healthcare professional.
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Frequently asked questions
This could be a condition called melanonychia, which occurs when the skin overproduces melanin or pigment-producing cells (melanocytes). It can be caused by various factors, including HIV and antiretroviral therapy, or it can occur naturally in individuals with a dark complexion.
This could be a sign of endocarditis, a bacterial infection in the heart.
This could be caused by a splinter haemorrhage, which occurs when tiny blood vessels beneath the nail break and bleed due to trauma such as hitting the nail, prolonged pressure, or nail biting.
Sudden changes to your nails may signal a more serious issue, so you should seek medical attention right away.
