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Vertical lines on thumb

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 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? I consulted a primary physician and he told it was nothing.
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Dr. C.R.V.Narasimhalu
Dermatologist 11 yrs exp Chennai

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