I have done 8 RF microneedling sessions over 2 years with not much improvement on my acne scars. I don't break out as much now so I am looking for the best treatment for my scars. A surgeon recommended I get subcision with little silicone injected into my acne scars. He said silicone is better than filler for scars since it's permanent. He said my scarring isn't very deep& I should see improvement. Is silicone safe to inject in the face for scarring? Are there any long term side effects?