Black line beneath nail

From last 7 month i have notice that there is black line beneath on the thumb of my right hand. I completely know that i didn't get hurt so far, so this is not due to blood clot then What does that mean? Why they are keep on growing. For the first time when i noticed , it was just one line and later I got another
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Doctor Answers (1) on Black line beneath nail

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Himanshu Gupta Ghaziabad | Dermatologist
This may be a melanocytic lesion or some exogenous pigmentation, difficult to say from picture. You may consult in person @ Bhardwaj Medicos & Clinic 169, Gyan Khand IV, Sukkar bazar road Sumitra complex, Indrapuram Sat 4-5 pm Sun 10-12 pm Mon 4-6 pm
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