[Iniquity]

but seriously, it could be all kinds of things, from a sinus infection, or an allergy you arent aware of. What kind of heat do you have in your home? I hear electric heat is really dry and causes that with some people, especially if you do the majority of your breathing through your nose. Yeah I know we all breath through our nose, lol, but I mean like they say inhale through nose, exhale through mouth, etc, etc. some people just primarily breath through their nose, those that breath through their mouth alot are prone to heavily chapped lips etc.

just a hunch. I'd keep an eye on it and if it happens again soon, might want to see a doc to check it out.