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For as long as I can remember I’ve had vertical ridges in my nails. why are they are more pronounced in thumbs and pinkys?

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In brief: Onychodystrophy

It is very common and has many causes.
Most of which are benign. If it hasn't changed much in many years than it probably isn't anything to worry about. Nevertheless, you may wish to have a physician look at it. There is a small chance there is a fungal infection.

In brief: Onychodystrophy

It is very common and has many causes.
Most of which are benign. If it hasn't changed much in many years than it probably isn't anything to worry about. Nevertheless, you may wish to have a physician look at it. There is a small chance there is a fungal infection.
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