Query regarding forearm muscle regrowth.

Hi, I met with an accident in 2015 and broke my ulna bone which is been plated now. But after accident I lost some portion of muscle of my forearm on the ulna side so the doctor removed that portion of muscle from my forearm and did skin grafting. Now my forearm shape looks uneven due to removal of the muscle. Kindly let me know if the muscle around my forearm will regrow and the shape of my forearm will be even in future? If yes, how much time does it take for forearm muscle to re-grow & is there any specific diet or exercise that I should follow for regrowth of the muscle ? If no, what is the safe alternative available to get my forearm shape into normal. Response will be highly appreciated. Thanks in advance