How do I know if juvederm was misplaced or moved? The lump on one side of my face seems like it's in the wrong place.

Swelling and dense areas are common for 2 weeks after injections. You could schedule a follow up with your injector to have the area massaged. After 2 weeks your injector can assess the results better and provide the appropriate treatment. I hope this helps. All the best. 

Immediately after injection the HA products such as Juvederm absorb water and may look assymmetric or lumpy.  There is also possible swelling from the injection into soft tissue itself.  This lumpy appearance usually resolves in a few days but if it persists after 2 weeks return to the injecting doctor to see if more product is needed to even it out or if some product should be dissolved with Vitrase.

The swelling one normally experiences with Juvederm decreases dramatically by one week, and a little more in the second week.  Why not let a little time pass and then see your physician if the problem persists?