Noah Sinclair
A black mark on your nail can be a cause for concern. While it could be something harmless, such as a splinter hemorrhage or a colour variation, it could also be a sign of a more serious health condition. Melanonychia, a condition characterised by black or brown discolouration of the nail plate, is relatively common, accounting for about half of all nail discolouration cases. It can affect one or multiple nails on the fingers and toes. Other possible causes include injury, medication side effects, and health conditions such as HIV and cancer.
| Characteristics | Values |
|---|---|
| Name | Melanonychia |
| Appearance | Vertical or horizontal streak |
| Colour | Dark brown, grey or black |
| Thickness | Thin pencil mark to a broader band |
| Causes | Benign pigmentation changes, injury, medication side effects, health conditions |
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Melanonychia
If you notice changes to your nails, especially if they are painful, bleeding, and occur without explanation, you should not ignore them and should seek medical advice.
If you are concerned about a black line on your nail, your doctor may perform a biopsy to determine the cause. Treatment for melanonychia depends on the underlying cause and may include medication, surgery, or other therapies.
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Melanoma
A black mark on your nail could be a sign of melanoma, a type of skin cancer that affects melanocytes. Melanonychia, or subungual melanoma, is characterised by black or brown discolouration of the nail plate, which can affect one or multiple nails on the fingers and toes. It typically appears as a vertical streak running from the cuticle to the tip of the nail, although horizontal melanonychia is also possible. The colour can vary from dark brown to grey or black, and the thickness can range from a thin pencil mark to a broader band. Melanonychia can be caused by several factors, including pigmentation changes, injury, certain drugs and various health conditions such as HIV and cancer. While melanonychia is relatively common, accounting for about half of all nail discolouration cases, it is important to seek medical advice if you notice any changes in your nails, especially if they are painful, bleeding, or occur without explanation.
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Natural colour variation
A black mark on your nail could be the result of natural colour variation. This is a relatively common occurrence, accounting for about half of all nail discolouration cases. It can affect one or multiple nails on the fingers and toes. The colour can vary from dark brown to grey or black, and the mark can be thin or broad.
If you notice a black mark on your nail, it is important to pay attention to any other changes in your nails, such as changes in shape, texture, or thickness. While natural colour variation is often harmless, it is always a good idea to consult a healthcare professional if you have any concerns or if the changes are painful, bleeding, or occur without explanation.
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Injury
A black mark on your nail could be the result of an injury. This could be a splinter haemorrhage, which looks like a wood splinter under your nail. A black mark on your nail could also be melanonychia, which is characterised by black or brown discolouration of the nail plate. Melanonychia can be caused by injury, but it can also be caused by medication side effects or health conditions. It is relatively common, accounting for about half of all nail discolouration cases. It can affect one or multiple nails on the fingers and toes.
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Side effects of medication
A black mark on your nail can be caused by several factors, including medication side effects. While it could be something minor or normal, it is important not to ignore changes in your nails, especially if they are painful, bleeding, or occur without explanation.
Medications and medical treatments can cause black lines on the nails, which are usually horizontal and run across the nail's width. This type of nail discolouration is known as melanonychia and is characterised by black or brown discolouration of the nail plate. It is relatively common, accounting for about half of all nail discolouration cases, and can affect one or multiple nails on the fingers and toes. Melanonychia typically appears 3-8 weeks after starting treatment and usually fades within eight weeks of stopping or switching medications. Specific tests and therapies, such as X-rays on the hands and feet or phototherapy, can also increase the risk of developing black lines on the nails.
In addition to medication side effects, black lines on the nails can also be caused by natural colour variation, injury, or various health conditions, including HIV, cancer, and melanoma. Melanoma, a type of skin cancer that affects melanocytes, can present as black or dark stripes running down the nails. Therefore, it is important to seek medical advice if you notice any changes in your nails, especially if they are accompanied by other symptoms.
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Frequently asked questions
A black mark on your nail could be a splinter haemorrhage, melanonychia, or melanoma. It could be harmless or a sign of a more serious health condition.
Melanonychia is characterised by black or brown discolouration of the nail plate. It can affect one or multiple nails on the fingers and toes. It is relatively common, accounting for about half of all nail discolouration cases.
Melanonychia typically appears as a vertical streak running from the cuticle to the tip of the nail. 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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