I went to 3 dermatologists and all they say it could be a cause...
if you licked them with great force and bite with teeth or if you licked like people use to tightening them while playing video game,like a cacoethe or something, I believe!
In my case, I don't believe it
... If you licked they because they were dry, I think the problem was on(something you eat that don't agree whit your skin may the first cause), since that your lips said "Hey I'm too dry, I need to be clean, please do this!" And by licking the problem got worse
I think this can be totally beat!
If someone get a cure, that person will not look back, will not go to foruns to report that becouse that person really want to forget it forever
staring too much to the problem does not help, healthy eating, physical exercise and stay away from Depression is a good treatment