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Vertical lines on thumb

Hello doctors, I noticed a parallel vertical light black lines on my left thumb about a month ago. It's still there as it is. It is NOT thick, but it is very thin. They do not pain or have changed any colour. From a distance it just looks like ridges, but if I examine nearby, then I can see the lines. They are not there in any other fingers. What could this be? Vitamin deficiency?
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Dr. Manju Lihala
General Physician 36 yrs exp Kolkata
Please see a doctor since it is difficult to advise without examining.
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