Juvederm - Does It Expand After Injection?

Juvaderm  will attract water from the body and cause some additional swelling at the site of injection for 1 - 2 days.  This will settle and disappear relatively quickly.  Just the trauma from the injection can cause some swelling as well.  Correction of the area treated should be evident immediately and not dependant upon waiting for "swelling " to occur.  It sounds like you need more Juvaderm to the areas you wish corrected or be accepting of a lesser result if cost is a factor. 

I have never used expansion of the product as an excuse for not injecting more product. The hyaluronic acids are hygroscopic, meaning that they attract water, but my understanding is that the water attraction is an isovolumetric phenomenon. This means that they attract water as they breakdown, merely maintaining their original volume, not expanding.
Certainly after one week any expansion phenomenon would have stabilized enough to proceed with further treatment to the desired effect.

Juvederm like all HA's absorb water as part of the process and will swell in the area a bit, it should dissipate rather quickly and I wouldn't expect to last. I tell patients that at the end of the procedure, what they see is really what it will look like for the time the product lasts.  It may go down slightly after the initial swelling subsides.