I'm not missing the point at all here. I never used chapsticks or lipbalms either. People can have allergy to a food they eat everyday without knowing they have an allergy to it. I recently wrote a post about allergy to protein. There are different kinds of protein. Some people are just allergic to milk protein, while other might just be allergic to meat protein, and others might be allergic to lots of types of protein. From what I know about allergies is they come and go or stay forever. Sometimes, kids' immune systems change as they get older so they lose an allergy. My nephew used to be allergic to nuts when he was a younger kid, but he lost the allergy as he became an older kid.
I'm not saying allergy is the cause of EC for everyone. What I meant about missing the point is others saying leaving lips alone will cure everyone's lips (even if they have an allergy that will keep making the lips peel).