OMG you guys. I've been thinking for the longest time that it must be linked to the digestive system or thyroid as well but i still hadn't done much research on EC and therefore didn't know that this link already exists. I'm so glad it was brought up because I also have a hypothyroid condition (low thyroid). I have had it since I was a child. My fraternal twin sister has low thyroid and EC as well which is what led me to believe this lip condition may have been a result of either the thyroid problem or a digestion irregularity or IBS (Irritable Bowel Syndrome). The thyroid gland controls your digestive system so people with a thyroid condition may also experience stomach problems. For me, stomach acidity is high. Does anyone else have IBS or lots of bloating, heartburns, irregular bowel movements like frequent constipation or diarrhea etc? And does anyone else have both Hypothyroid and IBS? Me and my twin are both pretty thin yet we still have IBS. Some people don't even know what IBS is but if you have some of the symptoms that I just described than chances are you may have IBS.
Although here is a paradox. My younger brother also has low thyroid from childhood and IBS except he doesn't have EC. He occasionally has a bad lip during the winter but then it's gone.
Another possible link may be little sleep or insomnia. I don't sleep very well. Could this also be a cause? Does anyone else have problems going to bed?