I have had a chapped bottom lip for about a year. It is always the bottom lip, not the top. It's not just in winter though, it was happening in summer, and I live in a warm climate so it seems odd. I of course have tried (medicated) lip balm as well as staying hydrated (water) I believe it was before I got a lot of my severe TMS symptoms (back neck etc pains). I tried doing a search on this here but didn't find a lot. Does anyone think there could be a medical condition for this particular issue or know what it could be?