How to tell if I have an Artefill granuloma and if so how should I manage?

In June 2011 I had an artefill injection. 1 syringe (total) with injection in both cheeks and nasal fold. In 2012 lumps began to form. Through treatment of prednisone the lumps eventually went away. However, just a few weeks ago the bumps began forming again. I can "feel" them form, a slight tingling in the cheek areas. I can feel, but not see them. My question is, are granulomas? With symptoms such as this should I be concerned for more severe issues and how should I manage ongoing?