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Doctor insights on: Black Line On Toenail Causes

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What causes black toenail?

What causes black toenail?

Blood,fungus,other: The most common causes of black toenails are old blood from trauma and fungal infections. There are other dermatological and hematological causes, but they are not common. ...Read more

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Dr. Arnold Beresh
340 doctors shared insights

Toenails (Definition)

Toenails are the hard coverings at the end of the toes. Nails are made out of a protein called keratin. They function to protect the end of the toe and to increase sensitivity of touch. Good nail care is important to prevent ...Read more


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What causes black and blue toenails?

What causes  black and blue toenails?

See a podiatrist: If you are runner, this is a common injury called "black toe syndrome" due to blood bruises under the nail plate. Other causes of black toenails are infections - either bacterial or fungal. Another cause may be from a fracture in the last bone of the toe. In any case, see a podiatrist who can examine and treat any of these conditions and recommend ways to prevent recurrence. ...Read more

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What causes black lines in the toenails?

What causes black lines in the toenails?

Various things: In people with skin of color it may be a normal variation. Skin growths may also cause them, both of the benign and malignant kind. See your dermatologist. ...Read more

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What can cause black/purple toenail root?

Injury: Usually some time of injury will cause discoloration due to bleeding under the nail. ...Read more

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Half of my toe nail is brown/black, what could be the cause?

Half of my toe nail is brown/black, what could be the cause?

Many things: Many things can cause discoloration of a toe nail. It could be blood resulting from a history of trauma or a fungal infection. I would advise seeing a podiatrist or dermatologist to rule out anything more serious, such as melanoma. ...Read more

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My husband has a toe nail that is rotten & black & the nail is coming off , what could be the cause ?

Most likely Fungus: This sounds like a fungal infection of the toenail. There are various treatment options. Topicals don't work well, but may if you are aggressive with treatment. Oral medication may be needed. This conditiion may be caused by repetitive trauma. Have him see your local podiatrist for evaluation and treatment options. Dr l. ...Read more

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