Ava Monroe
A brown line on your nail is called longitudinal melanonychia or longitudinal striata. It is a common phenomenon, affecting about 1% of the population, although it is rare in children. The line can be caused by a variety of factors, ranging from harmless pigment deposits or growths to infections, body-wide diseases, or melanoma (skin cancer). Melanonychia can appear in one or more nails and may be a natural occurrence in people with dark skin. However, it is important to consult a doctor to determine the underlying cause and rule out any serious health issues.
| Characteristics | Values |
|---|---|
| Name | Melanonychia |
| Description | A brown or black color in your nail |
| Occurrence | Can affect your fingernails or toenails. It can be in one nail, a few nails, or all of your nails |
| Natural Occurrence | Can occur naturally in people with a dark complexion |
| Causes | Melanocytic activation, trauma, infection, cancer, vitamin B12 deficiency, vitamin D deficiency, protein deficiency, too much iron, malnutrition, genetic disorders, fungal infection, pregnancy |
| Diagnosis | A doctor can perform a series of exams to determine the cause of melanonychia |
| Treatment | If malignant, the cancerous area must be removed |
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What You'll Learn
- Melanonychia: the medical term for brown or black lines on nails
- Potential causes: from vitamin deficiencies to skin disorders
- Melanonychia striata: a type of linear melanonychia
- Diagnosis: a doctor can perform exams to determine whether it's malignant
- Treatment: if malignant, the cancerous area must be removed
Melanonychia: the medical term for brown or black lines on nails
Melanonychia is the medical term for brown or black lines on nails, which can appear on either the fingernails or toenails. It can affect one nail, several nails, or all nails. The lines usually look like stripes that begin at the bottom of the nail bed and continue to the top.
The condition occurs when pigment cells, called melanocytes, deposit melanin, a brown-coloured pigment, into the nail. As the nail grows, a stripe of brown or black appears. Melanonychia can occur naturally in people with a dark complexion, but no matter the cause, it is recommended that individuals seek medical advice as the lines may indicate other health issues.
There are several types of melanonychia:
- Longitudinal melanonychia: This is the most common type of melanonychia and can appear as light to dark brown or black stripes that run from the nail bed to the tip of the nail. The lines are parallel and regular in colour, thickness, and spacing, with a clearly defined border.
- Diffuse or total melanonychia: This type involves the entire nail turning dark.
- Transverse melanonychia: This type of melanonychia appears as a band that runs across the nail from one side to the other.
The causes of melanonychia can range from harmless to potentially fatal. Some possible causes include:
- Melanocytic activation: This involves an increase in the production and deposits of melanin in the nail but not an increase in pigment cells.
- Melanocyte hyperplasia: This refers to an increased number of melanocytes in the nail, which can be benign or malignant.
- Trauma or injury to the nail.
- Infection, including bacterial, viral, or fungal infections.
- Malnutrition or vitamin deficiencies, such as low levels of vitamin B12, vitamin D, folate, or protein.
- Cancer, including nail melanoma or nail bed melanoma, which is the most serious possible cause of melanonychia.
If you notice any dark streaks or lines on your nails, it is important to consult a doctor or healthcare professional for a proper diagnosis and treatment.
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Potential causes: from vitamin deficiencies to skin disorders
A brown line on your nail is called longitudinal melanonychia or longitudinal striata. It is the most common type of melanonychia, a medical term for black or brownish pigmentation of the nail plate (the hard part of toenails or fingernails). While melanonychia can occur naturally in people with a dark complexion, it is always a good idea to consult a doctor to rule out any underlying health issues.
Longitudinal melanonychia can have many causes, ranging from harmless pigment deposits or growths to infections, body-wide diseases, or melanoma (skin cancer). Melanonychia occurs when there is an overproduction of melanin or an increase in melanocytes (pigment cells). These increases in melanin or melanocytes can be caused by harmless growths, injuries, infections, or cancer.
Vitamin deficiencies
Deficiencies in vitamin B12, vitamin D, and folate can cause dark lines in nails. Malnutrition and a lack of certain nutrients in your diet can also cause changes to your skin and nails.
Skin disorders
Melanonychia can be caused by skin disorders, including melanoma, the most serious possible cause of melanonychia. Melanoma of the nail bed usually presents as a band of brown-black colour, wider than 1/8th of an inch, with an irregular or blurred border. It may also be associated with a change in the size or growth rate of the band. Melanonychia caused by melanoma does not typically fade. Other benign skin disorders that can cause melanonychia include nevi (moles) and lentigo (flat, pigmented areas of skin).
Other potential causes of melanonychia include:
- Trauma or injury to the nail
- Bacterial, fungal, or viral infections
- Drug reactions
- Endocrine disorders
- Exogenous pigmentation
- Myxoid cysts (small, benign lumps that occur near a nail)
- Pregnancy
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Melanonychia striata: a type of linear melanonychia
Melanonychia, also known as melanonychia striata or longitudinal melanonychia, is a brown or black discolouration of the nail. It may be diffuse or take the form of a longitudinal band. It can present in individuals of all ages, including children, and affects both sexes equally. It is more prevalent in people with skin of colour, especially Fitzpatrick skin type V and VI. Nearly all Afro-Caribbean people will develop black-brown pigmentation of the nails by the age of 50. Melanonychia affects up to 20% of Japanese people. White-skinned people are less commonly affected.
Melanonychia striata is characterised by a tan, brown, or black longitudinal streak within the nail plate that runs from the proximal nail fold to the distal part of the nail plate. It is due to increased activity of melanocytes or melanocytic hyperplasia in the nail matrix, with a subsequent increase in melanin deposition in the nail plate. The most common cause of melanonychia striata associated with melanocytic activation is ethnic melanonychia, which occurs in dark-skinned individuals. Other causes of melanonychia striata related to melanocytic activation include pregnancy, chronic local trauma, infections, medications, dermatological disorders, endocrine disorders, alkaptonuria, hemochromatosis, porphyria, graft-vs-host disease, Peutz-Jeghers syndrome, and Laugier-Hunziker syndrome. Causes of melanonychia striata associated with melanocytic hyperplasia include nail matrix melanocytic nevus, nail lentigo, and nail apparatus/subungual in situ and invasive melanoma.
Melanonychia can be caused by inflammatory skin diseases that affect the nails. It can also be caused by inflammation due to friction from shoes and biting nails. Chemotherapy is the medicine most likely to cause melanonychia. Other medications that may cause it include medicines used to treat HIV/AIDS and medicines used to prevent or treat malaria. Malnutrition can also cause melanonychia, especially a lack of protein, vitamin D, or vitamin B12.
Melanonychia 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 cancer, too much iron, and other health conditions. A dark vertical line on the nail can indicate nail melanoma. In most cases, melanonychia striata is a benign condition, especially in children. Consequently, most investigators advocate a "wait-and-see" approach.
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Diagnosis: a doctor can perform exams to determine whether it's malignant
A brown line on a fingernail or toenail is called melanonychia, and it can have many causes, some benign and some more serious. It is important to have a doctor examine your nails if you notice discolouration, as it may be a sign of an underlying health issue.
A doctor can perform several exams to determine whether melanonychia is malignant. They will first take a medical history and examine the nails, determining the number of affected digits and observing the pattern and colour of the discolouration. They may also perform a dermatoscopic exam, using a specific type of microscope called a dermatoscope to closely examine the discoloured areas. This process is called onychoscopy and can help differentiate melanonychia from other conditions.
If the doctor suspects malignancy, they may order a biopsy for further confirmation. This procedure involves removing a part of the nail and examining the cells of the streak more closely. This is considered the gold standard for an accurate diagnosis.
In some cases, the doctor may require further tests to aid diagnosis. They may refer the patient to a dermatologist who specialises in nails for a specialised evaluation and biopsy.
If the melanonychia is found to be malignant, the tumour or cancerous area must be removed, which may mean losing all or part of the nail, or in some cases, the finger or toe.
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Treatment: if malignant, the cancerous area must be removed
If a brown line on your nail indicates melanoma, it is imperative to act quickly and decisively. Treatment requires the removal of the cancerous area to prevent further spread and potential health complications. Here is a step-by-step guide on what to expect:
- Diagnosis Confirmation: Before proceeding with any treatment, a definitive diagnosis of melanoma is crucial. A dermatologist will examine the nail and may perform additional tests, such as a nail biopsy, to confirm the presence of cancerous cells.
- Surgical Removal: The most common treatment approach is surgical excision. This involves removing the affected nail, along with a margin of healthy tissue, to ensure all cancerous cells are eliminated. The procedure is usually performed under local anesthesia, and the surgeon will aim to preserve as much of the nail unit as possible.
- Nail-Bed Surgery: In more advanced cases, or when melanoma affects a larger area, surgery may extend beyond the nail. This could involve removing the entire nail bed and the underlying bone. Such procedures are more complex and often require reconstruction using skin grafts or local flaps to restore the appearance and function of the finger or toe.
- Lymph Node Assessment: If there is a concern that melanoma may have spread, a sentinel lymph node biopsy may be recommended. This procedure identifies and removes the first lymph node(s) that cancer is likely to spread to, aiding in staging and determining further treatment plans.
- Follow-up Care: Regular follow-up appointments are essential after the surgical removal. This allows your doctor to monitor your recovery and detect any early signs of recurrence or spread. They may also recommend additional treatments, tailored to the stage of melanoma and your overall health.
- Nail Reconstruction: For cases requiring extensive nail-bed surgery, reconstructive procedures can enhance the appearance and functionality of the affected finger or toe. This may include the use of prosthetic nails or other cosmetic techniques to improve aesthetic outcomes.
Early detection and treatment of nail melanoma are critical for optimal outcomes. If you notice any unusual changes to your nails, including brown lines, consulting a dermatologist is highly recommended for a comprehensive evaluation.
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Frequently asked questions
A brown line on your nail is called longitudinal melanonychia or longitudinal striata. It is caused by an increase in the production and deposits of melanin in your nail.
Longitudinal melanonychia appears as brown, black, or grey bands that run from your nail bed to the tip of your nail.
Melanonychia can be caused by harmless pigment deposits or growths, infections, body-wide diseases, or melanoma (skin cancer).
The prevalence of melanonychia is about 1% of people of any age, but it is extremely rare in children.
A brown line on your nail may be harmless, but it could also be a sign of an underlying condition. It is important to get it checked by a doctor or healthcare provider.
