I have a light discoloration on one side of my lower lip. I went to a doctor and he froze it, but it came back. When I was growing up I worked with my dad on a boat and I would get sunblisters and cold sores all the time in this area. My dad had me put camphor on it to heal it. I mentioned this to the doctor and he said it could possibly be scar tissue. It doesn't hurt or anything like that just looks like I have a cold sore all the time. Any idea what this could be?