Just going to say, I did say I used an antibiotic and that it can* come back more than once, not it should. My chammy only had this for about a month before it completely went away. Maybe you could read and not skim before you try to insult someone.
Also only putting antibiotic on it won't...
Honestly it looks just like what my chameleon had and still gets. It's from eating and there is no way around it. There are two pockets in their mouth, one on each side where the upper lip and lower lip meet, and food gets stuck in there and turns to puss therefore making it look swollen...
So I have a Jacksons chameleon, her name is Minx, and is about 2 years old, maybe a little younger(2-4 months). I have to go to school and am very busy throughout the day but I always make sure to check and take care of her but this morning I noticed her right eye, like where the socket meets...