Why are the corners of my mouth so puffy?? I'm only 22!! (photos)

The corners of my mouth stick out and give my face a weird shape. I also have weird pockets of fat right underneath them. What is this and how can I fix it? The muscles around my mouth have also been bothering me lately but I can't tell if it's because something is wrong or because I've been focusing so much on it. I clench my jaw and grind my teeth at times because of my medication. I also struggle with the position of my jaw when I sleep.