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Doctor insights on: Black Streaks Under Toenail

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Both big toenails discoloured, blue looking; right one particularly looks as though black streak in it. Slight pain but nothing major. What to do?

Both big toenails discoloured, blue looking; right one particularly looks as though black streak in it. Slight pain but nothing major. What to do?

Microtrauma: It sounds like your toenails are hitting the end of your shoe. This usually happens if the toe box is either too small (toe is pressed up against the end) or too large (foot is sliding around and the toe is hitting the end). This is very common in runners--it can lead to either thickening of the nail, or it may eventually turn black and fall off--a new nail will grow in within a year. ...Read more

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 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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Why are my toenails turning black?

Why are my toenails turning black?

Too little info: Too little info here...Could be many things from trauma to fungal issues...You need to see your family doc or a podiatrist for a good history and physical exam. ...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 should I do with a black toenail?

What should I do with a black toenail?

Black toenail: Have it examined, & treat the cause, such as trauma. ...Read more

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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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Are there any home remedies for black toenails?

Black nails: Black nails can be caused by trauma from running and hitting your toes in the toe box. Another one could be a toe nail fungus called tinea nigra. You would need to be evaluated by a family doctor or a podiatrist. ...Read more

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Skin around my toenail is black, what should I do?

Get it looked at: A black discoloration of the skin around the nail could be due to a variety of reasons including infection, trauma, or in rare instances a skin cancer. If you have not notice any significant improvement or if it has increased in size, you should having it looked at by your primary care physician who may want to refer you to a dermatologist or podiatrist for a biopsy. ...Read more

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What causees toenails to turn black around the edges?

Black toe nails: Black colored toenails could be from trauma, fungus , hematoma and even a rare form of cancer. See a podiatrist for a biopsy to play it safe. ...Read more

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My toenail has turned black and hollow. What should I do?

The nail lifted: From either fungus or an accumulation of blood klnown as a subungual hematoma. Your choices are too leave alone if not painful or see a podiatrist who will give you option of removing the nail and allowing a new one to grow back. This is sometimes done as the current nail may be deformed. ...Read more

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