black streaks under toenail

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10070856x1386629751 Neutral_expert_x_teeny

Could I have acral lentiginous melanoma? I have a thick white nail streak on my toenail that has been there for about a year. I am half black.

Melanoma

Melanoma
Most melanomas in the nail region appear as a black or brown /black irregular streak. However, a dermatologist should examine the area to make sure acral melanoma is not present
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Dr. Thomas Inwood answered:

My toenails are a grey black what does it mean and touching the toenails hurt i also have light streaks down my index finger?

Toenails

Fingers
You don't mention if there is any thickness associated with the discoloration. Just on what you state , it may be a fungal infection. But there are other causes of discoloration and sensitivity. Seek the help of a podiatrist - you will be glad you did . good luck !
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11202683x1386632249 10526410x1386629535

Hurt big toenail last yr. It fell off. Saw 2 or 3 faint streaks in the part growing back. I'm 37, black, and a weightlifter. Any cause for concern?

Probably not

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

Trauma

Genetic
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.
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Dr. Sewa Legha answered:

I recently noticed a light brown stripe going down my thumbnail. Could it be a melanoma? I'm black & struggle with toenail fungus but not on my hands.

I understand your co

Skin_cancer
Your concern is valid as melanoma in blacks affects nail beds more often than in whites. But what it is too early to tell. I would advise you to look closely at the upper end of the nail fold(near the skin junction) and see if there is any growth or redness there. Also watch this streak for any changes over the next few weeks. If it changes,i.e. becomes darker or larger, then see a dermatologist .
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What could be the cause of vertical black lines in finger and toenails? I had a nurse tell me it could mean heart problems but after listening to my heart said it sounded normal.

Please

Please see a dermatologist. It could just be melanonychia due to increased pigmentation, but a skin cancer called melanoma can also present with streaks. You may need a biopsy.
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11202683x1386632249 10526410x1386629535

What causes black toenail?

Blood,fungus,other

Fungal_infection
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.
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10536503x1391892832 9021_x_teeny

Why are my toenails turning black?

Too little info

Toenails
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
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My toenail turn black and hallow?

The nail lifted

Subungual_hematoma
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.
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What causes black lines in the toenails?

Various things

Skin
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.
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