On Monday I noticed my lips were hurting and I thought maybe they'd gotten sunburned, until I realized it's the inside, not the outside. Yesterday they hurt more, mostly just inside the rim of my lip and the corners were trying to crack. I look like I've been eating a red popsicle-- bright red around the inside rim of my lips and it hurts like it's burned. Any ideas what this could be? I have enough trouble eating with the nausea and food aversions-- painful lips is not helping!