Hi - I was thinking the same thing recently - but it almost seems to simple. What if the lips are just constantly swollen and it continnually stretches the skin which makes them peel. I think on my son his lower lip is bigger than the top (which doesn't peel as much) But infmlamation should be pretty easy to cure with steroids and things - I wonder are most peoples lips swollen all the time? Maybe the skin on the lips doesnt adjust and just continually gets stretched and peels because of that?