How do you distinguish between under-eye fat repositioning and under-eye fillers?

I have both sunken and bulging areas under my eyes, so I'm not sure what solution to look into.

At first, I thought I could simply supplement it with fillers, but I also learned about a method called under-eye fat repositioning.

I heard that while both can be used to improve the impression under the eyes, the underlying causes may differ.

I am wondering how to distinguish between cases where fat is protruding and cases where there is actually a lack of volume.

I want to avoid a situation where I choose the wrong method and fail to get the desired results.

If you have sought counseling for similar concerns, please let me know what diagnosis you received.

I would also like to hear the criteria that are important to consider when deciding on surgery or a procedure.