I had Silikon 1000, micro droplet for acne scarring 4 years ago. In three spots it’s slightly over injected.

Silicone biopolymers can cause severe longterm complications including inflammation and nodule formulation. Although results are longer-lasting that Juvederm or Restylane, long-acting fillers should be avoided.  
Bellafill, Artefill, and PMMA are known to cause granulomas and permanent nodules with swelling. This is not the case for everyone. Silicone biopolymers can also cause similar chronic inflammatory conditions. 
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

Visible silicone bumps after microdroplet Silikon1000 treatments may be improved. We may treat bumps with dilute steroid injections or light electrosurgical desiccation. Hope this helps. Dr Joseph