i have the exact same thing. did you ever figure out what it was? i was just talking to my husband about it and i think its weird that i use chapstick ALOT also.
I too have this, except I have several white bumps on my bottom lip, I also have a dry chapped line going through it, my top lip covers this but I'm sure people still notice, I am only 16 years of age and I am really confused, I have not been in any seriouse sexual activity therefor it cannot be anything major. What could this be?