I Had a PMMA-based Filler in Mexico. It is Irritating, Painful and Itchy. What Can I Do?

I think there are a couple of options to try and improve the problems you are having after the PMMA injections you had in Mexico.  One option would be to try and have a steroid, like Kenalog, injected into the areas where you are having the problems to see if that improves anything.  If that does not help, the only other option I can think of for the lumps would be surgical excision.  

Bellafiil is an FDA-Approved facial filler that has been used to correct facial volume with aging or dermal volume with atrophic acne scars. Results are longer-lasting that Juvederm or Restylane. 
Bellafill and Artefill are known to cause granulomas and permanent nodules with swelling. This is not the case for everyone. 
In my practice, I specialize 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. 
Silicone biopolymers can also be removed from the body if there are signs of migration or inflammation. All of these filler-types should be removed as early as possible. 
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