I’d definitely say teething, my 4 month old has been the same and constantly wanting to chew on things and dribbly, if your son is the same I’d say teeth are on their way soon xx
He's been teething since 5 weeks old but today is the first time it's only been one cheek that's red and hot, it's usually both x
Is he rubbing his ear or chewing/drooling more? Classic teeth coming through signs x