Wow - this one is tough without being able to see  you. If the Juvederm had been done more recently, I would say yes, it could be the Juvederm. Because, sometimes the hyaluronic acid fillers do have a bit of a bluish cast where the skin is very thin, pale or if it's injected too superficially.   But Juvederm generally lasts 6-12 months at the most, with the longer times being with the Juvederm UltraPlus which has a higher molecular weight.  All the Juvederm should be gone by now!

One way to find out for sure, is to have your dermatologist inject a little of the enzyme hyaluronidase (he/she can order this if they don't have it) into the area. If it's still due to Juvederm, the Juvederm will melt instantly and you will both have your answer.