Is it common to feel pain after Bellafill? I got it in my cheeks and smile lines just yesterday but it hurts to smile.

Some pain and tenderness is typical after injections and should resolve in 1-2 weeks. Cold compresses and icing may help. It will take several weeks for final results with Bellafill. Best, Dr. Emer

Bellafill and Artefill are known to cause granulomas. Although used for soft tissue augmentation, they can, and are known to cause permanent nodules and swelling. This is not the case for everyone. 
My office specializes in the removal of Bellafill and Artefill injections, in addition to silicone biopolymers, from the face and body. Initially, treatments are non-surgical with corticosteroids and immune modulators. If unable to be corrected, we can also perform surgery in some cases. 
Lastly, our office is conducting ongoing studies of plasma-assisted corticosteroid application, which allows for diffusion of the treatment medication in superficial tissue without causing atrophy. 
Best, 
Dr. Karamanoukian 
Realself100 Surgeon

It is possible to develop some mild pain after a Bellafill injection.  Normally, this should resolve completely over time but it could take several days to a week or so.  If you feel the pain is getting worse or is not improving, you should contact the physician who treated you.

There should be some mild pain after the procedure for a few days. If severe, it needs to be evaluated. OTC pain medications should cover the pain. Rarely, a nerve is injured during injection and that takes a while to recover.