Oh my gosh, I have dealt with the same annoying swelling on my lip off and on for years noIw. I've always wondered what it was from, I do bite my lips as a nervous habit, I always thought it was from that. I recently discovered that I am gluten intolerant and have an appointment scheduled for Celiac testing, as I've been having some major GI issues lately (bloating, and acid reflux so bad that sometimes it makes me want to throw up, along with eosinophilic esophogitis.) It's great to see that other people have the same lip reaction that I do, I never would have suspected gluten. interesting. and now I can hopefully prevent it, if it is caused by gluten.