My bottom lip, not my top one, only the bottom one, has been peeling or chapped constantly for months now. I have used every product imaginable, and nothing works. I take a multi vitamin everyday, and my top lip is fine. Although I do bite my bottom lip occasionally, I never had this problem before a few months ago. I am a healthy 27 year old female and was wondering if this was potentially a symptom of a more serious problem. I can not find anything about this online, and hope someone can give me some advise. Thank you!