I was peeling free since almost a year now and I constantly apply bepanthen still whenever I feel dry lips.
In my case it was candida, that caused no physical symptoms but the side effect of altered commensal microbes was peeling lips. I could confidentially say that peeling lips can become the gold standard symptom to diagnose yeast overgrowth in the future.
Problem with the medical community is that it doesn't even recognize something called as yeast overgrowth then how does it understand something which is a side effect of yeast overgrowth.
Peeling lips is a symptom of yeast overgrowth in the gastrointestinal system or in some cases just in the mouth.
Best way to cure this condition from my own experience is
1. Exercise regularly, increase physical activity. This problem is only seen people who leads modern sedentary lifestyle.
2. Avoid all kinds of sugars
3. Drinking bitter beer somehow seems to help this condition!