how do you "squeeze" it out?Looks like a mandibular abscess to me, though it is awfully close to the commisure of the mouth, so a temporal gland infection is also likely. My guess is that if you give it a squeeze (gently), thick white/yellow cottage cheese stuff will come out. If so, it will need to be debrided by a vet who will also put your cham on antibiotics. Even if it's not , it still needs to go to the vet.
Usually this can be secondary to a husbandry issue, though it could be secondary infection from trauma due to a fractious insect.
I'm glad your cham is eatting and looking fine right now, but remember, reptiles take a long time to get sick and even longer to heal. if you can fix it before the cham starts showing debilitation, you have a higher probability of fixing the problem (saving your chams life.)