I have never been sure. My lips are chapped and scaly all the time. I take the dead skin off only to have it either bleed or be raw. I am hypothyroid, so I figure that is probably the cause, but I wanted to clear up my confusion. Thanks.
Then I guess I have what you say I have. This has been ongoing for years and I haven't have unchapped lips in that amount of time, no matter what I've tried.