Why is the area under each of my nostrils sunken in?

Unfortunately, you have not provided a lateral view. It may be that the angle of your nose lip junction is elevated, perhaps due to the muscle and this may be the problem. Additional views are needed to give you a more accurate answer.

Best Wishes,

Gary Horndeski, M.D.

Based on your photo, it looks like you could benefit from fat transfer or filler in the area.

Best of luck !

To make an assessment on the outcome of a plastic surgery procedure we generally always need to see a complete proper set of before and after pictures. It would also be helpful to know exactly what procedure you have done. Rhinoplasty is not an operation, but a general term for many different procedures, having to do with the shape of the nose.
If you don’t have before, and after pictures in contact your provider and ask them to forward the pictures later. I also suggest you follow up with your provider regarding your concerns regarding the outcome of the procedure.
Best,
Mats Hagstrom, MD