I am 37 years old and just started to have these white things in my mouth in the morning, they look like high concentrated milk and they are easy to be peeled off, but this bothers me a lot, I have seen using some lip treatments before i go to bed every night, wonder if that caused it?
If it's just around the lips I don't think that's a big problem, I thought that was quite common and I figured it was from maybe chewing your lips a bit in you sleep? As you say it could also be from stuff you put on your lips, maybe try exfoliating your lips with an old toothbrush or a flannel before you put lip balms on? If it's actually peeling inside your mouth maybe see a doctor.