It would be a bit helpful to see a before and after photo here. Without knowing how much filler was done or what kind, this is hard to comment on. While most HA fillers will have been gone by now, there could be pockets of filler left behind (maybe!) if a lot was injected there, or you could have a hematoma under the skin. Most often a hematoma would have resolved by now, but I have seen them persist from time-to-time. I would consult with a board-certified injector in your area to see if it's filler, and hyaluronidase could dissolve it, or if it's a hematoma, and what options may be best in that case.