My lips have been burning and painful, more so on the moister inside portoin.. not on the inside of my mouth. I have spent a great deal of time in the sun, and assumed they may be sunburned, but the exterior part isn't sore. I didn't know if it could be because of the moisture, or not. I also had what i thought was a coldsore, that i treated with rubbing alcohol, and that went away relatively quickily. I have also, however been eating a lot more fresh fruit (melon, pineapple, strawberries and peaches) as well as tomatoes. how can i treat the soreness?