I just noticed this today on my puffer but didn't really think much about it until I just tried to feed my fish and he ate nothing. He always eats like a pig. And now I'm not sure if I'm just being paranoid but I feel like he's acting very strange. It's sort of like bubbles on his chin but then it turns into a white string. He has it on his chin, a lot on one side of his face (I couldn't really get him to show it but you can somewhat see it on the side of his face in some pics), and then a tiny bit on the side of his face that is shown. Please someone help me identify this I know nothing about diseases.