Sorry to hear you have this, if you do. I have mild burning in my lips from full-body SFN. Whenever I get it, I use Burt's Bees, moisturizing my lips, and it goes away immediately. So it works for me. I'm not sure if there's a mechanical reason for mine though, which is why I said it's from my SFN. I do have a number of cervical issues though for what it's worth. Perhaps Glenn can speak to physical causes, if any.