I have an underbite. During the summer my bottom lip gets sun burned to the point of bleeding. I wear sunblock that I put on everytime I come up and I wear a large brim hat that I keep in my bcd and put on everytime I come up from a dive. The reflexion of the water is killing me. I wanted to see if anyone has any other ideas that might help. Surely I am not the only person that gets sun burned lips.