You should consult a certified dermatologist, plastic surgeon or facial plastic surgeon for assessment. Hopefully, it is too much filler placed incorrectly, but infection should be ruled out.
If the problem is just too much filler, it may be melted with hyaluronidase and you can start over again with filler. I would start by replacing lost volume in your upper cheeks and then proceeding to the lower face areas as needed. You should also consider Botox to lift the corners of your mouth. With this approach, you would have a more youthful, natural appearance.