You can either remove your existing chin implant and replace with a larger one, or put a filler overtop of the implant. The filler will likely last approximately 1 year in this location, sometimes longer.
Thank you for your question. I often use fillers to augment the chin when a patient doesn't want to undergo surgery for a chin implant. Both Radiesse and Voluma are good choices for this area, with results that can last up to two years or even longer in some cases. The quantity will depend on...
The degree of your microgenia (lack of chin projection) would require a lot of Radiesse which is only a temporary fix so I would not recommend it. You would do better with a chin implant if you want a simple fix. When Radiesse is injected properly it should not cause your brow to fall.