Isla Bennett
Dark lines on your fingernails or toenails are called melanonychia. These lines are usually brown or black and can appear in one nail or several. Melanonychia occurs when the skin overproduces melanin or pigment-producing cells (melanocytes) and can be caused by various factors, including HIV, antiretroviral therapy, and endocarditis. Melanonychia can also be caused by trauma to the nail, such as hitting the nail or nail biting, which can cause tiny blood vessels beneath the nail to break and bleed. In some cases, melanonychia may be a symptom of subungual melanoma, a type of cancer.
| Characteristics | Values |
|---|---|
| Name | Melanonychia |
| Description | Brown or black lines that usually look like a stripe that begins at the bottom of the nail bed and continues to the top |
| Types | Longitudinal melanonychia, total melanonychia, transverse melanonychia, Beau lines |
| Causes | Increased melanin deposits in the nail, changes in nail pigmentation, HIV, antiretroviral therapy, endocarditis, trauma |
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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.
It is important to note that nail discolouration can be a sign of various health conditions, and if you notice any changes to your nails, it is recommended to consult a healthcare professional for proper diagnosis and treatment.
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Beau lines
A black line in the nail bed can be a symptom of a number of conditions. The medical term for a black or brown line on the nail is melanonychia, which occurs when the skin overproduces melanin or pigment-producing cells (melanocytes). Melanonychia can be caused by a number of factors, including HIV and antiretroviral therapy, or it may occur naturally in people with a dark complexion.
If the black line is thick and horizontal, this is known as a Beau line. Beau lines are usually not harmful, but nail discolouration in the nail bed can be a symptom of a type of cancer called subungual melanoma.
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Endocarditis
A black line in the nail bed can be a sign of endocarditis, a bacterial infection in the heart. Endocarditis occurs when the lining of the heart or heart valves become inflamed due to a bacterial infection. It is a serious condition that requires prompt medical attention and treatment with antibiotics.
In addition to black lines on the nails, other symptoms of endocarditis can include fever, chills, fatigue, night sweats, weight loss, shortness of breath, and joint pain. Individuals with endocarditis may also experience changes in their heart rhythm, such as a fast or irregular heartbeat.
If you notice a black line on your nail, especially if it appears on multiple nails, it is important to see a doctor as soon as possible. Your doctor will likely perform a physical examination and may order additional tests, such as blood tests or an echocardiogram, to confirm the diagnosis of endocarditis. Early detection and treatment of endocarditis are crucial to prevent serious complications, such as heart valve damage or heart failure.
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Splinter haemorrhages
It is important to note that if you notice any changes in your nail appearance, such as a black line, it is recommended to consult a healthcare professional. They can evaluate the nail and determine if any further evaluation or treatment is necessary.
Additionally, maintaining proper nail care and avoiding habits that can cause trauma to the nails, such as nail biting, can help reduce the risk of splinter haemorrhages and other nail-related issues.
In summary, splinter haemorrhages are a result of trauma to the nail, causing tiny blood vessels beneath it to break and bleed. While they are usually not harmful, it is always best to consult a healthcare professional for proper evaluation and advice if you notice any changes in your nail appearance.
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Subungual melanoma
A black line in the nail bed can be a symptom of subungual melanoma, a type of cancer. Melanoma is a cancer that arises from melanocytes, the pigment-producing cells in the skin. Subungual melanoma is a rare form of melanoma that occurs in the nail bed. It is more common in people with darker skin pigmentation and can present as a black or brown line running vertically or horizontally along the nail bed. This is known as longitudinal or transverse melanonychia, respectively.
Melanonychia occurs when the skin overproduces melanin or when there are changes in nail pigmentation. It can be caused by various factors, including certain medications and health conditions such as HIV and antiretroviral therapy. In some cases, melanonychia may occur naturally in individuals with a dark complexion.
It is important to note that not all black lines in the nail bed are indicative of subungual melanoma. Narrow black lines that start in the nail bed and extend across the entire nail are often the result of melanonychia, which is typically not harmful. Thicker lines that create a horizontal stripe on the nail are called Beau lines and are usually benign as well. However, if you notice any changes in your nails, it is always best to consult a healthcare professional for proper diagnosis and treatment.
Additionally, black lines on multiple nails can be a sign of endocarditis, a bacterial infection in the heart. This occurs due to damaged blood vessels and can result in black lines appearing on more than one nail. Trauma to the nail, such as hitting it or nail-biting, can also cause splinter hemorrhages, leading to thin, dark lines running vertically along the nail.
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Frequently asked questions
This is called melanonychia and can occur naturally if you have a dark complexion. It can also be a sign of endocarditis, a bacterial infection in the heart.
The lines are brown or black and usually look like a stripe that begins at the bottom of the nail bed and continues to the top.
Longitudinal melanonychia: a black or brown line running vertically along the nail bed in the direction of nail growth. Total melanonychia: black or brown discolouration across the entire nail bed. Transverse melanonychia: a black or brown band running horizontally across the nail bed.
If you are concerned about any changes to your nails, you should consult a doctor.
