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Some mark on thumbnail

One straight line mark of light dark color is there on my thumbnail since long time may be for around 2-3 years or more than that. Why is it is there any problem ?
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Doctor Answers (1) on Some mark on thumbnail

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Dr. Hithysh BM Bangalore | General Physician
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Hello it may be due to zinc deficiency or anemia trauma should be ruled out consult physician or dermatologist for further evaluation and treatment.
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