Dark vrtical line  thumb

I have a slight vertical dark line or like a vertical band on my right thumb. Ihave no pain. I reallly cant remember but recently noticed it.., is that ok??
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Dr. Srinivas C
Dermatologist 18 yrs exp Bangalore
Post a pic so that I can understand it better. Difficult to assess without seeing it. Has it encroached the nail.
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