when i first got this over a decade ago i started off with dry lips.. they eventually go to peeling and if aggravated by licking/biting/picking then they become inflammed.
When the inflammation becomes chronic(keeps going) because of pulling skin off, we enter Exfoliative Cheilitis. The way i see it with normal peeling lips you only have a moisture problem involving sebum(oil). With Exfoliative Cheilitis you have two problems, one is sebum and the other is dead skin(keratin). Because of the chronic inflammation our lips "mentality" have adjusted to producing higher amounts of dead skin to protect our lips.
I hope you understand. Vitamin A can restore the normal time limit of our skin cells. It alone won't cure it. But it can take us out of Exfoliative Cheilitis and back into peeling lips. With peeling lips it is a moisture/protection/inflammation issue. I already explained the items used to combat this.