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VA
A female asked about a male:

What causes black lines in the toenails?

3 doctor answers4 doctors weighed in
Dr. Jeffrey Kass
Podiatry 29 years experience
Sometimes this: Is a normal variant, sometimes it could be blood that is dried, melanoma at times needs to be ruled out.
Dr. HECTOR Franco
Dermatology 47 years experience
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.
Dr. Heidi Fowler
Psychiatry 26 years experience
Different causes: Black stripes down 1 nail may be subungual hematoma. Red or brown streaks may be splinter hemorrhages. Brown/black lines from nail plate to tip are often seen in people with dark skin & are normal. Subungual Melanoma can cause nail ridges & dark colors of cuticle. It most often effects the thumbs or big toes. Dark lines may be due to other illnesses. Get checked out when in doubt.

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Philippines
A 41-year-old female asked:

I have black lines on my toenail is it something I should be worried?

4 doctor answers5 doctors weighed in
Dr. Brian Wagner
Podiatry 19 years experience
Black lines: This could be caused by your skin color with melanin within the nail root. If there is one line or so and your light skinned i would have it looked at.
Canada
A 26-year-old male asked:

What cause faint lines on toenails?

2 doctor answers3 doctors weighed in
Dr. Glenn Aufseeser
Podiatry 10 years experience
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.
Daytona Beach, FL
A 44-year-old female asked about a 52-year-old female:

What causes lines, ridges & bumps in fingernails & toenails?

1 doctor answer2 doctors weighed in
Dr. David Hettinger
Podiatry 37 years experience
Could be MANY things: Reasons range from prior serious illness, psoriasis, trauma, metabolic disease, infection, etc. It's tough to tell without more details and an exam.

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Last updated Nov 1, 2018
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