Black lines on nails

I observed some black vertical lines on my thumbnails.Its there since may be last 7-8 years. Is this a nutrient deficiency or something else? Now i observed another thin line on my ring finger. Should i worry ? How can i get it treated ?
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Doctor Answers (1) on Black lines on nails

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Dr. Sidaarth Khera Delhi | Dermatologist
Usually black vertical lines on nails are not a cause of concern.Rarely they can be due to some trauma or disease like lichen planus or drug eruption. Pls visit a physician nearby for detailed check up.
Medically it is called melanonychia. Pls read about it.
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