Different reasons: White lines can be caused by malnutrition or liver disease. Dark lines in black people over age 20 is usually normal. Black stripes down one nail could be a subungual hematoma. Red or brown streaks could be splinter hemorrhages.
Answered 5/24/2017
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A doctor has provided 1 answer
A doctor has provided 1 answer
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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