I read the responses of the other physicians, and I respectfully disagree with most of them.
I have been personally using Silikon-1000 for cosmetic facial enhancement since my Fellowship in Advanced Facial Plastic and Reconstructive Surgery without significant incident. The vast majority of my patients are thrilled with their results, and complications are few. My mentor who trained me to perform the micro-droplet injection technique has a 45 year favorable experience with liquid silicone injections.
I counsel my patients that several treatments are typically necessary to achieve a desired result, and that he most common problem is overcorrection and the development of nodules or bumps at the sights of injection. In my hands this occurs in 3% of patients, and these are usually small and easily treated with dilute triamcinolone (steroid) injections or light electrosurgery.
I have not seen migration, pain, or recurrent inflammation in any of my patients.
Silikon-1000 is a permanent filler, so your results, good or bad, are permanent. You should find a board-certified dermatologist or facial plastic surgeon experienced with the micro-droplet technique. You should also see many before and after photos demonstrating beautiful results before you pick your doctor.
I hope this helps, and best regards.