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Black line on toenail causes

A 49-year-old member asked:
Dr. Adam Teichman
Orthopedic Foot and Ankle Surgery 19 years experience
Rubbing in a shoe: If you are runner this is a common occurence due to pressure with the nail and the shoes. We call this runner nail. If you are a runner or not sekin... Read More
Dr. David Hettinger
Podiatry 36 years experience
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.

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A 21-year-old member asked:
Dr. Andrew Oswari
Family Medicine 24 years experience
Onychomycosis: Depending on your age it could be fungus on the toenail. You should see your doctor who could get a scraping and send it to the lab to be analyzed.
Dr. Gregory Fehr
Emergency Medicine 45 years experience
Toenails: You probably have a fungus in your toemails. Many therapies are out there but soaking them in vineger twice a day and using some tinactin (tolnaftate)... Read More
Dr. Alan Ettinger
Podiatry 49 years experience
Fungus: Is the most likely cause. I suggest you see a podiatrist.
A 36-year-old member asked:
Dr. Arnold Beresh
Podiatry 41 years experience
Trauma: Usually trauma or injury will cause bleeding under the nail and the appearance of being black & blue.
Dr. Grace Torres-hodges
Podiatry 23 years experience
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 ... Read More
A female asked:
Dr. Jeffrey Kass
Podiatry 28 years experience
Sometimes this: Is a normal variant, sometimes it could be blood that is dried, melanoma at times needs to be ruled out.
A 45-year-old member asked:
Dr. Arnold Beresh
Podiatry 41 years experience
Injury: Usually some time of injury will cause discoloration due to bleeding under the nail.
A female asked:
Dr. Jehangir Rao
Specializes in Holistic Medicine
Wait: It might take 12 to 18 months for a new nail to grow out. Is it only 1 toe? If multiple have your toes checked out
A 37-year-old male asked:
Dr. Bradly Shollenberger
Podiatry 36 years experience
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.
A 23-year-old female asked:
Dr. Jeffery VanYperen
Podiatry 12 years experience
Chemical: They probably used either phenol or sodium hydroxide to kill the matrix (nail root) in the corner, preventing another ingrown toenail in the future. ... Read More
A member asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Please : Please see a dermatologist. It could just be melanonychia due to increased pigmentation, but a skin cancer called melanoma can also present with stre... Read More
A 20-year-old female asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Melanonychia Striata: Melanonychia striata is a brown-black lines in the nail the goes from the base to the tip of the nail. Get it checked just to make sure it isn't rel... Read More

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