I have a hard, painful and swollen lip 6+ months after the first Juvederm was injected?

Given your history I would schedule to see your doctor who injected you so they can ascertain from a physical examination whether this is an infection or another cause of a lump and treat accordingly. 

Thank you for your question. I recommend having a follow up with your injector for evaluation to determine if this is an infection or another cause. However, he/she may want to dissolve your filler to be on the safe side. Best of Luck!

This is common and most likely to be a cross antigen reaction. In most cases it can be settled down with some anti-inflamattories over the next few weeks. Your injector would know exactly what to do to settle this down, most often it does not need to be dissolved. All the best Dr Davin Lim. Brisbane. Australia.