Liam Carter
Dark lines on your nails are called melanonychia and can be a natural colour variation, especially in people with darker skin tones. However, they can also be caused by injuries, certain medications, infections, skin conditions, endocrine disorders, and even cancer. Melanonychia can sometimes be a sign of melanoma (skin cancer). Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture.
| Characteristics | Values |
|---|---|
| Medical term | Melanonychia |
| Colour | Dark brown, grey or black |
| Thickness | Thin pencil mark to a broader band |
| Direction | Vertical or horizontal |
| Causes | Nail injury, infection, skin conditions, endocrine disorders, vitamin B12, vitamin D or protein deficiency, too much iron, nail cancer, melanoma |
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What You'll Learn
- Melanonychia: the medical term for a dark line on your nail
- Causes: including vitamin deficiencies, skin conditions, and endocrine disorders
- Cancer: a dark line on your nail can be a sign of melanoma
- Treatment: if malignant, the tumour or cancerous area must be removed
- Prevention: see a healthcare provider if you notice changes to your nails' colour, shape, or texture
Melanonychia: the medical term for a dark line on your nail
A dark line on your nail is known as melanonychia. The lines are usually brown or black and look like a stripe that begins at the bottom of the nail bed and continues to the top. Melanonychia may appear in one nail or several.
The condition can develop due to many causes, including nail cancer, trauma, and other health conditions. Deficiencies in vitamin B12, vitamin D, and protein can cause dark lines in nails. Other causes can include too much iron, certain medications, infections, skin conditions, and endocrine disorders like Addison's disease or hyperthyroidism. Melanonychia can sometimes be a sign of melanoma (skin cancer).
A doctor can perform exams to determine whether melanonychia is malignant. Dark stripes on nails typically appear due to increased deposits of melanin, which gives skin its colour. Melanonychia can also occur naturally if you have a dark complexion.
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Causes: including vitamin deficiencies, skin conditions, and endocrine disorders
A dark line on your nail, known as melanonychia, can be caused by a number of factors, including vitamin deficiencies, skin conditions, and endocrine disorders. Melanonychia can appear as a brown or black stripe that runs along the nail bed, and can occur on one or more nails. While it may be a normal colour variation, especially for those with darker skin tones, it can also indicate certain vitamin deficiencies, such as a lack of vitamin B12, vitamin D, or protein. Skin conditions, such as injuries or infections, can also lead to melanonychia. Additionally, endocrine disorders like Addison's disease or hyperthyroidism can cause dark lines on the nails. In some cases, melanonychia may be a sign of melanoma or nail cancer, so it is important to consult a healthcare provider if you notice any changes in your nails' colour, shape, or texture.
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Cancer: a dark line on your nail can be a sign of melanoma
A dark line on your nail can be a sign of melanoma (skin cancer). This is known as melanonychia, which causes a streak of dark pigmentation that runs along the nail bed. It can appear as a thin pencil mark or a broader band, and can occur on one or several nails. Melanonychia can also be caused by a number of other factors, including injury, infection, or certain medications. It is more common in people with darker skin tones. Although it is usually harmless, it is a good idea to see a healthcare professional if you notice any changes to your nails' colour, shape or texture.
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Treatment: if malignant, the tumour or cancerous area must be removed
A dark line on your nail is called melanonychia and can be a normal colour variation, especially in people with darker skin tones. However, it can also be caused by injuries, certain medications, infections, skin conditions, and endocrine disorders like Addison's disease or hyperthyroidism. Melanonychia can sometimes be a sign of melanoma (skin cancer).
If melanonychia is malignant or cancerous, the tumour or cancerous area must be removed. This may mean losing all or part of your nail. In some cases, the finger or toe that has the tumour may also need to be removed. A nail biopsy can also cause a structural irregularity because it removes a portion of the nail. A doctor can perform exams to determine whether melanonychia is malignant.
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Prevention: see a healthcare provider if you notice changes to your nails' colour, shape, or texture
A dark line on your nail is called melanonychia and can be a normal colour variation, especially in people with darker skin tones. However, it can also be caused by injuries, certain medications, infections, skin conditions, endocrine disorders, or even cancer.
Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture. This is because melanonychia can sometimes be a sign of melanoma (skin cancer).
If your melanonychia is malignant or cancerous, the tumour or cancerous area must be removed. This may mean you'll lose all or part of your nail. A nail biopsy can also cause a structural irregularity because it removes a portion of the nail.
Therefore, it is important to be vigilant about any changes to your nails and to seek medical advice if you have any concerns.
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Frequently asked questions
A dark line on your nail is called melanonychia. It can be a normal colour variation, especially in people with darker skin tones, but it can also be caused by injuries, certain medications, infections, skin conditions, endocrine disorders, or even cancer.
Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture. A doctor can perform exams to determine whether melanonychia is malignant.
Melanonychia may appear as a brown or black stripe that begins at the bottom of your nail bed and continues to the top. The colour can vary from dark brown to grey or black, and the thickness can range from resembling a thin pencil mark to a broader, more noticeable band.
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