Noah Sinclair
A thin brown line on a toenail is known as longitudinal melanonychia or longitudinal striata. It is the most common type of melanonychia, a medical term for a black or brownish pigmentation of the nail plate (the hard part of toenails or fingernails). Melanonychia can have many causes, from harmless pigment deposits or growths to infections, body-wide diseases, or melanoma (skin cancer).
| Characteristics | Values |
|---|---|
| Name | Longitudinal melanonychia or longitudinal striata |
| Description | A brown or black stripe that begins at the bottom of the nail bed and continues to the top |
| Causes | Harmless pigment deposits or growths, infections, body-wide diseases, melanoma (skin cancer), trauma, bacterial, fungal or viral infection, drug reaction, endocrine disorders, exogenous pigmentation, excess melanin production within the nail matrix, nevi |
| Treatment | Have a doctor check for melanonychia as the lines may be a sign of other health issues |
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What You'll Learn
Melanonychia
A thin brown line on the toenail is called longitudinal melanonychia. It is the most common type of melanonychia, a medical term for a black or brownish pigmentation of the nail plate (the hard part of toenails or fingernails). Melanonychia may appear in one nail or several. These lines can occur naturally if you have a dark complexion.
There are two types of melanonychia: longitudinal and transverse. Longitudinal melanonychia presents as brown or black stripes that run parallel and regular in colour, thickness, and spacing. The border will be clearly defined and less than 3 millimetres in width. Transverse melanonychia is similar, except the lines go side to side across the nail instead of up and down.
No matter the cause, it is important to have a doctor check for melanonychia because the lines may be a sign of other health issues.
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Melanin production
A thin brown line on a toenail is called longitudinal melanonychia or longitudinal striata. This condition is caused by excess melanin production within the nail matrix. Melanin is a pigment that colours your nails, hair and skin.
Melanin is produced by cells called melanocytes. Melanin production is a natural process that can occur if you have a dark complexion. However, excess melanin production can be caused by a number of factors, including trauma, infection, endocrine disorders, exogenous pigmentation, and nevi. Melanonychia may appear in one nail or several and can have many causes, from harmless pigment deposits or growths to infections, body-wide diseases, or melanoma (skin cancer).
Longitudinal melanonychia that is not cancerous is typically light to dark brown in colour and has a clearly defined border of less than 3mm in width. The lines are parallel and regular in colour, thickness and spacing. Another sign that longitudinal melanonychia is not cancer is the yellowish fading of colour along the outer edges of the stripe. Melanonychia caused by a serious disease does not typically fade.
If you notice a brown line on your toenail, it is important to have it checked by a doctor as it may be a sign of other health issues. A basic understanding of nail anatomy and the recognition of different types of nail lines can help clinicians properly diagnose and treat nail diseases and recognise possible underlying systemic diseases.
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Trauma
A brown line on the nail is called longitudinal melanonychia or longitudinal striata. It is the most common type of melanonychia, a medical word for a black or brownish pigmentation of the nail plate (the hard part of toenails or fingernails).
Brown-black nail lines may represent blood from trauma. If a blackish mark is caused by an injury, it will tend to move toward the tip as it grows, leaving behind an unblemished nail. This is because the injury will cause the nail to stop growing at the point of impact, but the nail will continue to grow at the cuticle. This means that the mark will move towards the tip of the nail as the nail grows out.
Longitudinal melanonychia that is not cancer is typically light to dark brown stripes. The lines are parallel and regular in colour, thickness, and spacing. The border will be clearly defined and less than 3mm in width. Another sign that longitudinal melanonychia is not cancer is the yellowish fading of colour along the outer edges of the stripe. Melanonychia caused by a serious disease does not typically fade.
No matter the cause, it is important to have a doctor check for melanonychia because the lines may be a sign of other health issues.
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Infection
A thin brown line on a toenail could be a sign of infection. This is known as longitudinal melanonychia, which is the most common type of melanonychia, a medical term for black or brownish pigmentation of the nail plate. Melanonychia can be caused by harmless pigment deposits or growths, but it can also be a sign of infection, body-wide diseases, or even melanoma (skin cancer).
Longitudinal melanonychia is characterised by brown or black lines that usually look like a stripe that begins at the bottom of the nail bed and continues to the top. These lines can occur naturally if you have a dark complexion, but they can also be a sign of other health issues. It is important to have a doctor check for melanonychia, as the lines may indicate an underlying infection or other health problem.
In the case of infection, the brown line on the toenail could be a sign of a bacterial, fungal, or viral infection. Treatment for this type of infection may involve the use of antibiotics or antifungal medications, depending on the specific type of infection. It is important to consult a healthcare professional for proper diagnosis and treatment.
Additionally, it is worth noting that the presence of a thin brown line on the toenail could be a sign of subungual exostosis, which is a bony overgrowth of the fingertips or toes that may be caused by persistent bone irritation. Myxoid cysts, which are small, benign lumps that occur near a nail, can also cause longitudinal melanonychia. However, these conditions are typically not associated with infections.
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Vitamin deficiencies
A thin brown line on a toenail is called longitudinal melanonychia. This is the most common type of melanonychia, which is the medical term for a black or brownish pigmentation of the nail plate. Melanonychia can be caused by harmless pigment deposits or growths, but it can also be a sign of infections, body-wide diseases, or melanoma (skin cancer).
The appearance of a brown line on your nail is related to how much melanin is being made in your body. Melanin is a pigment that colours your nails, hair, and skin. Vitamin deficiencies can affect the production of melanin and other pigments in the body, which can lead to changes in the colour and appearance of your nails.
For example, a deficiency in vitamin B12 or folic acid can cause your nails to become brittle and discoloured. This is because these vitamins are important for the production of red blood cells, which carry oxygen to your nails and other tissues. A lack of oxygen can cause the nails to become thin and discoloured, and in some cases, a brown line may appear.
Additionally, a deficiency in biotin (vitamin B7) can also cause nail changes, including thinning and discolouration. Biotin is important for the metabolism of fatty acids, which are necessary for maintaining the health of your nails. A lack of biotin can lead to a build-up of fatty acids in the nails, causing them to become discoloured and brittle.
It is important to note that while vitamin deficiencies can cause nail changes, there are also many other possible causes, including trauma, infections, and endocrine disorders. Therefore, if you notice any changes in your nails, it is always best to consult a doctor or healthcare professional for a proper diagnosis and treatment.
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Frequently asked questions
A thin brown line on a toenail is called longitudinal melanonychia or longitudinal striata.
Longitudinal melanonychia can be caused by harmless pigment deposits or growths, infections, body-wide diseases, or melanoma (skin cancer).
You should have a doctor check for melanonychia, as the lines may be a sign of other health issues.
Melanonychia caused by a serious disease does not typically fade. If it is not cancerous, you may notice the stripe fading to a yellowish colour along the outer edges.
Yes, melanonychia may appear in one nail or several.
