Do you mean he has lost weight around his throat and he puffs it up or does it look irritated? They can puff up their throat andthey can put on weight there too. Grifs changes. If he gets grumpy hell puff up his belly and neck. I hope he doesn't have an infection. Did you say the vet you were going to take him to doesn't treat frogs? I remember you were going to try and find out.