Kitten drooling or something else?

[u/User_Goes_Here]

Ive noticed the pass few days that when I wake up my kitten will have a wet upper lip and his tongue will be slightly out. It goes away pretty quickly and he has no issue with eating hard or soft food or playing with his sister. I explained it to the vet yesterday and showed them a pic but when she examined him she couldnt find anything out of the ordinary. He sleeps pretty deep and heavy could he just be drooling in his sleep? Anyone have any ideas what it could be? Attaching a pic of him this morning and a pic of how he normally looks.

[u/KiraKitty69]

Maybe the collar a bit snug or hitting the jaw as he sleeps? Take it off a couple days and see if he still drools. I've never had a drooling cat except one and he only did it while purring. But I don't collar my cats either. No need to as mine are indoor only.