Jacs,
I’ve had different cancers, but once after my surgery to remove all my teeth (29) my face, mouth and neck was extremely swollen. I called the oral surgeon, and he told me to go to their emergency room, which I was going to do anyway if I didn’t hear back. I was there several days, and given meds to help the swelling . At home, I continued to sleep on an incline in the recliner for several months.
It sounds unusual, and the cause should be investigated, and properly treated, in my opinion. It could be nothing, but at least you looked into it, and can’t be faulted at that!
I hope this helps.