My lips started peeling years ago. Sloughing of a layer, regrowth, sloughing again. I tried cortizone--it worked, but it thins the skin. I mentioned it to my dermatologist. He told me that he'd seen that and it's a reaction to green colored toothpaste or mouthwash. I stopped using that. It went away completely. If I try green dental cleansers again--it comes back. I hope this helps some people. By the way, my dermatologist was named one of the top ten doctors in Washington, DC.