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Doctor insights on: Black Line On Toenail Causes

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Dr. Janice Alexander
Board Certified, Obstetrics and Gynecology
36 years in practice
1M people helped
1

1
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. Bennett Machanic
Board Certified
46 years in practice
47M people helped
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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


Dr. HECTOR Franco
Board Certified, Dermatology
40 years in practice
263K people helped
2

2
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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Dr. Bennett Machanic
Board Certified
46 years in practice
47M people helped
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Dr. Grace Torres-Hodges
Board Certified, Podiatry
17 years in practice
1M people helped
3

3
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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Dr. Arnold Beresh
Board Certified, Podiatry
35 years in practice
34M people helped
4

4
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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Dr. Bennett Machanic
Board Certified
46 years in practice
47M people helped
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Dr. Bradly Shollenberger
Board Certified, Podiatry
30 years in practice
638K people helped
5

5
I'm 37, black and a weightlifter. I hurt my big toenail last year. It fell off. Now, i saw 2 or 3 faint streaks in the part growing back. Is there any cause for concern?

I'm 37, black and a weightlifter. I hurt my big toenail last year. It fell off. Now, i saw 2 or 3 faint streaks in the part growing back. Is there any cause for concern?

Probably not: Discoloration of a nail after trauma isn't unusual. As long as the mark moves and is replaced by clear nail, it generally isn't a concern. ...Read more

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Dr. Richard Taddeo
Board Certified, Podiatry
20 years in practice
502K people helped
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Dr. J. Lawrence Dohan
Board Certified, Dermatology
51 years in practice
6M people helped
7

7
Can ingrown toenails cause high cholesterol? I have had them taken out 9 times even black stuff put in now i just do it myself as much as i can

Can ingrown toenails cause high cholesterol? I have had them taken out 9 times even black stuff put in now i just do it myself as much as i can

NO: You need a podiatrist and a physician. If you have high cholesterol----high ldl----you need to define the meaning of it. You may benefit from exercise and diet. You can save your money and throw away the cod liver oil and the coconut oil. Get a podiatrist to help with toenails. There is no connection between the nails and cholesterol. ...Read more

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Dr. Heidi Fowler
Board Certified, Psychiatry
19 years in practice
527M people helped
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Dr. David Laha
Board Certified, Podiatry
32 years in practice
808K people helped
9

9
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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Dr. Grace Torres-Hodges
Board Certified, Podiatry
17 years in practice
1M people helped
10

10
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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Dr. Bennett Machanic
Board Certified,
46 years in practice
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