My cheekbones have been increasing in size for 2 years since 19. Why is this?

My cheekbones were somewhat prominent before 19. But I noticed after I turned 19, my jaw and cheekbones grew. I figured both grew to match each other and maintain the ratio. But now, turning 21, my cheekbones and cheekbones arches keep growing while my jaws had stopped. I noticed there are half-pea-size lumps on my cheekbones also, especially when I smile they clearly show. What contributes to my cheekbones (and arches) growth? Would pressing and pinching them cause them to be bigger?