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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

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?

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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What are the causes of a swelling foot and leg and turning black?

What are the causes of a swelling foot and leg and turning black?

Vein disease common: Venous insufficiency is a common cause of swelling and hyperpigmentation (blackening). This circulation problem is often easily curable although the cosmetic damage may not be completely reversible. A simple, painless and relatively inexpensive ultrasound test can determine if this is the cause. A phlebologist or other physician experienced in this area can quickly assess this problem. ...Read more

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Top of foot turning black and swelling, what could be the cause.?

Top of foot turning black and swelling, what could be the cause.?

Foot turning black: Something must have happened for that black swelling to occur.
Please have someone take you to the nearest Emergency facility. Things should work out OK. ...Read more

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What could cause two little toes on one foot to turn black and hurt?

What could cause two little toes on one foot to turn black and hurt?

Blood or gangrene: If the toenails are black, you may have old blood under the nail or fungus in the toenail. If the skin of the toe is black you may have gangrene which is when there is no circulation to the toe. In the latter case, gangrene, you need to see a podiatrist immediately or go to the emergency room to have your circulation checked! ...Read more

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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?

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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About a month ago half my toe nail turned black. It hasn't gone away or even lessened. What's the cause and how to get back to normal color?

About a month ago half my toe nail turned black. It hasn't gone away or even lessened. What's the cause and how to get back to normal color?

Dry blood: It is very common to have bleeding under the toenail without an injury. Everyday walking causes pressure from the toenail hitting the shoe, which can cause tearing of the nail plate from the nail bed which will make the nail look black. In most cases this is self-limiting. However rarely this can be melanoma And needs to be evaluated. ...Read more

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Can paint thinner cause black toe nails?

Can paint thinner cause black toe nails?

It can contribute: Pain thinner directly would not cause the discoloration but thinning out of the nail plate due to the chemicals could cause the toenails to become vulnerable to infection by fungus, yeast or bacteria. ...Read more

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I have a black spot under both of my big toe nails. What can cause black spots under my big toe?

I have a black spot under both of my big toe nails. What can cause black spots under my big toe?

Subungual: Hematoma or blood under the nail is a possibility. Splinter hemorrage is also possibility. Melanoma can present this way but fact yu have it on both big nails would render this possibility as less likely. ...Read more

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So I have this black blister on my foot. I'm freaking out cause my bf said it looks like a blood blister and it can kill you. Is that true?

So I have this black blister on my foot. I'm freaking out cause my bf said it looks like a blood blister and it can kill you. Is that true?

Dry blood: When a blood blister dries, it usually turns black. But if it is moist and black with redness of the surrounding skin it may be an infection. Infections can be serious when bacteria get into the blood. In such cases the symptoms include fever, chills and pain. Oral or IV antibiotics are used when this develops =medical treatment. ...Read more

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Black spot under toe nail spot is on nail I have been taking apple cider vinegar pills for a few months could this have caused it.

Black spot under toe nail spot is on nail I have been taking apple cider vinegar pills for a few months could this have caused it.

No: The dark spot could be a small bleed under the nail but if it does not grow out, seek consultation with a podiatrist or dermatologist. ...Read more

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What causes toenails to be thick and hurt?

What causes toenails to be thick and hurt?

Fungus vs. Trauma: The 2 most common causes of painful, thick toenails are fungal infections and traumatically induced changes to the nail. For a complete and thorough diagnosis, visit your local podiatrist. A culture/biopsy may need to be informed to distinguish the cause. ...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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What cause faint lines on toenails?

Nail lines: Changes in nails can result from trauma, fungus, and systemic conditions such as psoriasis. I would recommend evaluation by a podiatrist or dermatologist if you are concerned. ...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 could cause a painful and discolored toenail!?

Blood: Known as a subungual hematoma and or fungus are two popular ones. ...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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What does it mean when your toenail turns black and blue?

Hematoma: Sounds like you traumatized your nail and blood is under it. Blood under the nail is called a subungual hematoma. ...Read more

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Why is there a vertical black line on my right big toenail?

Why is there a vertical black line on my right big toenail?

Trauma: A dark line that runs vertically down the nail can indicate that you might have traumatized the nail matrix (the area where the nail starts growing). Other possibilities are fungus, melanoma and genetics. See your doc for a full evaluation. ...Read more

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What's the reason why my toenails are black and blue underneath?

What's the reason why my toenails are black and blue underneath?

Bruised...: They probably had some sort of trauma causing a bruise under the nail plate, most likely from rubbing in the shoes. This should grow out with time. ...Read more

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How do I get my normal toenail back after a severe black toenail?

Avoid more trauma: Assuming you mean the typical "black nail" which develops from either direct or repetative low grade trauma (ie: toe banging up against tip of shoe in runners), the "black" needs to grow out. If more trauma or pressure can be avoided, the color will grow out as the nail grows. This may take many months. ...Read more

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I have little black seed looking dots under my toenail. What is it?

Splinter: Hemorrhages is a possibility. Can get that from trauma to the nail can also be seen with bacterial endocarditis. ...Read more