Brown line through nail

I have this almost 2 mm thick brown line running vertically through my left index finger. from the stem of the nail to the top.
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Venkat Raghav
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Hello.... Nail pigment bands or melanonychia are quite common in people who have dark skin.There are numerous other reasons why nail pigment banding occurs: trauma to the nail, medication, systemic diseases, vitamin deficiencies .If nail melanoma is suspected then a biopsy will be performed.consult your doctor.
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