I have had a very small white patch of skin on my bottom lip where my lip connects to my regular skin. it's completely flat with no pain or itchiness. My dermatologist didn't even notice it til I pointed it out today and he suggested "freezing it" like a wart and said it's possible it is pre-cancerous. He wasn't too worried about it though. Wanted to get a second opinion first. Is it possible it goes away on its own? It's been there for a few months now.