What can be done about my uneven chin?

 Facial asymmetry is a very common thing. I see the asymmetry that you are describing in your photos. The first and easiest thing to try would be filler injections.  Even easier would be to ask your doctor to inject saline to get an idea of how this would look prior to the  more expensive fillers. I hope this helps!

You have a difference in the two sides of your jaw in which one side is smaller than the other. It is ore than just in the chin. The deformity extends from the chin back further into the jawline. While injectable fillers will help that is both a temporary and expensive approach to treatment of the jaw asymmetry and is certainly not a lifelong treatment strategy. The best approach is to have a custom jawline implant made from a 3D CT scan that will provide jawline augmentation on the deficient side that matches to the opposite fuller side.