Is this a muscle in my cheek or a fat pad? (photos)

This bulge shows up when I make a kissy face and I don't like it. It's only on one side. The corner of my mouth on that same side also pulls down when I smile whereas the other side curves up. My cheek is also a little "chubbier" on the bulge side as well. What is it and what can I do about it?

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