What can I do about sunken cheeks? I'm only 38 but look to be in my forties! (Photo)

People have been asking if I've lost weight because my face keeps thinning. In fact, I have gained 9 pounds in an effort plump up my face but it's not working. On my right cheek, I developed a line that goes from the top of my cheekbone to a dimpled area next to my mouth. I initially thought it was some sort of scar, but it might be the underlying facial structure showing through? The only medical condition I have is Grave's disease hyperthyroidism, currently in remission.