It seems like one of my cheeks is larger or more convex than the other. It's affected my overall look for quite some time now. My cheeks were close to perfectly symmetrical when i was little all the way up to 9th grade, but then my face changed.
Looking at my anatomy book, it seems that one side of my orbicularis oris is slighly larger making one side of my jowl look bigger. One side is also more convex than the other making it seem larger.
Here are pictures to explain better (asymmetry is much more apparent in real life)
bigger side (more convex)
smaller side (smaller and less convex)