Hello,
This can be due to transverse groove of the nose. It can occur as the result of heredity, accident, and/or the constant rubbing or wiping of the nose, commonly referred to as the allergic salute. If it is cosmetically unpleasant then laser treatment can take care of the same.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Is it like a wrinkle? People get a wrinkle from wiping the nose upward because it is itching or running, as with allergies.