To add to that I've been skinny all my life but still had my cheeks,out of nowhere they completely disappeared. I noticed I developed an underbite during this time. Could that maybe be a reason? I'm 19 now and gained 20 lbs, and my cheeks look fuller but the sides of my face still look flat creating that oval look still. I've noticed that I've gained a lot of fat in my neck area instead, So again please offer me your opinions it's bothered me for a while. P.s I'm 5"4 140 lbs male