What can I do to treat these festoons? I had non dissolvable fillers in my cheeks about 2 years ago (Photo)

Hi. Yes, malar festoons can be tricky. Yours are mild and likely will respond with minimally invasive tightening treatments, like Morpheus or Facetite. CO2 laser resurfacing is also a good idea. 

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.

Hi, festoons can be quite tricky to manage especially those concerning non-dissolvable fillers. 
First, you will need to identify the type of material injected and it's longevity to determine the next appropriate step. Some treatments which may be helpful would be a minimally invasive procedure with Radiofrequency microneedling (infini RF) or subcision Radiofrequency (Innoplus).
I would highly suggest you to have a professional consult with a board-certified plastic surgeon. Thank you.

The malar (upper cheek) festoons are created by weakening of the muscle in this area.  Gravity, genetics and sun exposure cause this as we age.  The soft tissues sag and begin pulling on the skin allowing fat and fluid to distort the appearance.  That is causing the squishy feeling.  Along with treating your allergies, avoid the allergens as much as possible and avoid other things causing fluid retention and swelling such as excess salt so that you have more less symptomatic days than bad days. Sometimes avoidance of dairy and wheat helps too.  A series of radiofrequency resurfacing treatments with PRP and skin care including UV protection and Retin A may offer nonsurgical solutions and if that does not yield satisfactory results surgery may be required for complete correction.

It is unfortunate that you have this issue with the filler injected into your face. It would be very helpful if you found out what filler was used and if it's something that can be removed especially if this was something similar to a polyacrylamide gel or biogel. Once the volume of the filler is significantly reduced, fat grafting works in a marvelous way producing natural and almost permanent results. I hope this helps and good luck from New York City plastic surgery