Scarsdale Juvederm doctors

Juvederm and Restylane, the hyaluronic acid fillers, can be used to fill under eye hollows, but this must be done with extreme caution. Swelling, bruising, and visible lumps or filler material are higher risk in this area than other areas of the face. If filler is injected too close to the surface in too great a volume, a blue tinge can be visible from the effect of seeing clear material through the surface of the skin. This is the Tyndall effect (a name from physics that has to do with the light refracting through the skin making it look blue when the stuff is really clear). Each of the hyaluronic acid fillers absorbs a different amount of the body's natural water once it's placed under the skin. This can either be a great advantage, or a disadvantage, if the material is not well understood by the physician and is used in a less than ideal way. Juvederm tends to absorb more water than Restylane, and this absorption is long lasting, so unlike the normal swelling that does go away after any injection, the doctor should be cautious and not overfill with Juvederm, since water absorption by the material is greater than with Restylane. A good result can be achieved with both.

Juvederm does absorb more water than other hyaluronate fillers like Restylane and definitely more than Radiesse.  This means that a little less needs to be injected to obtain a given degree of correction.  If it is injected to just the "perfect" amount visibly at the time of treatment, it will look a little overcorrected a few days later.   Juvederm or other hyaluronate fillers will spread more in tissues and provide less of a fill out than Radiesse which is a little stiffer in terms of it's ability to create a contour. 

If the contour you obtained looks good after a few weeks, then stick with it until it eventually absorbs.  If a really unsuitable shape or size has resulted, Juvederm and other hyaluronate fillers can be erased using the enzyme hyaluronidase which can be injected by your doctor.   

As you stated, the doctor told you that this filler is not reversible with hyaluronidase, therefore it is more likely Radiesse than Juvederm or Restylane. Even though it is likely that a nerve was injured (your old chin implant may have moved a nerve out of its natural pathway and left in in an unpredictable spot that was nicked by the filler needle), there is also a possibility that pressure from the new filler is squeezing it against the implant.

These are simplistic possibilites, but since your implant is old, and the material in it is unknown, the safest thing to do is to see a facial plastic surgeon who can help you properly evaulate the cause of this pain and make sure your old implant isn't causing a problem by breaking apart in some way.