I wasn't sure where to put this, so here it goes:
A few days ago my upper lip felt raw also, like a layer of skin was missing, leaving the soft layer below. I thought it was chapped and thought nothing of it. Then it hardened, and there is almost something of a crust on that lip. I also have these bumps on the roof of my mouth, that can be irritating sometimes. There is also something like a cold sore on my tongue, it is not a bump exactly, but a white ring kind of bump. I have recently had poison ivy on my face, and it is still on my ear (going away). The crust on my lip is hardly noticeable to the naked eye, and can be removed easily, so that is what leads me to believe it is a crust, rather than skin.