Hi and thank you for your question! As you indicated, it is quite rare for hyaluronic acid fillers (other than Voluma) to last this long. You did not mention the exact type of filler you got 2.5 years ago, so the first step is to determine the exact type of filler and ensure it was indeed a hyaluronic acid filler, since that’s the only type that can be dissolved with hyaluronidase. Additionally, you need to keep in mind that despite having fillers, the normal aging process continues and you need to exercise great caution in linking your current concerns with filler injected 2.5 years ago. If possible, comparison of serial pictures taken over the past couple of years combined with detailed physical examination by your experienced cosmetic doctor should help. This is very important as you do not want to subject yourself to unnecessary (and potentially harmful) injections unless your doctor can determine that your issues are indeed caused by residual fillers. I hope it helps and good luck!
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