Use sunscreen and lip balm! I was out fishing with a friend this weekend. I saw something on his lip. When I asked him about it he passed it off as a cold sore. He said it had been there for awhile. I took a long look at it, and I'm convinced that it's CANCER. Most likely basal cell, but it will need a biopsy. He's out in this sun daily, and doesn't take precautions. I use sun screen, but have forgotten about lip balm. I'll be adding that.