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dark lines on nails

I have black and red lines on my thumb nails,and have been told  that it is a symptom of something but no one knows what it is. Can you tell me?
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A related discussion, thick, black, raised  nail was started.
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A related discussion, Melononychia was started.
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A related discussion, dark line on middle left nail was started.
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Y.M
Iv'e also got a black line going through my thumb nail, but i don't know what it is and how to get rid of it.
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242489 tn?1210497213
MEDICAL PROFESSIONAL
Marie:

Most lines on the nails mean either minor trauma or nothing at all.  "Black and red" doesn't remind me of anything I've seen, though.  Perhpas you should show your internist or dermatologist.  But if you're otherwise healthy, there's probably no problem.

best.

Dr. Rockoff
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