The inside of my lower lip have turned red and is painful. I also have a couple of painful spots on the inside of my cheeks and tongue. The underneath part of the tongue which joins it to the lower palette feels dry, although its got saliva and feels sore too. When I drink water the underside of the tongue and inside of my lower lip feel very rough and dry (although its not dry) and I literally have to push my tongue free. What could be wrong?