Can encapsulated Restylane filler stay in your body forever?

I got Restylane injections two and a half years ago in my tear troughs that wouldn’t dissolve. Even after three tries with hyalase, I have hard lumps I can feel moving around when I press in underneath my eyes. Do encapsulated fillers eventually dissolve on their own? Is it safe to keep some amount of old filler in my face or will it cause me problems down the road, like inflammation or infections? I’d like to limit more hyalase, my under eye skin is so damaged from filler and repeated swelling.