Left and right side from my lips swollen (not the lips itself)

Patient: This question is not related to ACNE. What I’m having is pretty weird, not sure how to categorize it. So a couple days ago, in the evening,the muscles beside my lips (not sure if its a musle or not) got bigger, as if it is swollen. But there’s no pain, the left side is slightly bigger than the other. Not sure if there could be a connection, but I had mono 2 months ago.Thanks.

Doctor: