Thanks for the info..wow...didn't know that things could cause it. Could it be my flouride toothpaste? I was using natural toothpaste but funds were beginning to get low so I couldn't order online? The STD angle is out since I'm STD-free. Mouth Bacteria? Wouldn't a dentist find this out during my checkup? Overuse of chapstick? I thoguht that helped peeling lips. I'm going to do some research but these posts gave an idea of the some of the possible causes.