29 & had filler for hollows since 19, how to reverse Tyndall under eyes? (Photo)

It was difficult to say from the photo, but it did appear that there was some swelling under the eyes, as well. The swelling, if indeed present, has been termed under-eye "puffy pillows," and is believed to result from an inappropriate choice of filler for this thin, delicate region and/or too superficial placement of the filler, which would also account for the Tyndall Effect. In my experience, treating this problem, which can be difficult and persistent, typically requires the use of varying combinations, concentrations and amounts of intralesional anti-inflammatory agents. You would be wise to consult with an experienced, board certified cosmetic dermatologist filler expert. Hope this helps and best of luck.