Small mound on one side of mouth - what is it and how can I fix it? (Photos)

I have a small mound that has formed next to my mouth on one side. The other side is still pretty smooth, I can't figure out if this is a beginning marionette line or start of a jowl or what—I really want to know what this is so that i can figure out how to fix it. I am hoping the solution is not a facelift, but prepared for it.