Can't really tell by the pics because they're blurry. I would wait about an hour & see if the swelling goes down. If it looks like it's getting worse, I would try an antihistamine. Might he have got stung by something? Is his eye swollen? What does his gums look like? If there really pale, it could be a reaction to something. If it's just the one side of his face & no where else on his body, might just be a sting. or he could have bumped it.