Welcome. Glad to have you here.
Now for a cold dose of reality: You are only quit right now, because you are scared. My wager is that if those spots heal up, you'll go back to steeping cat turds in your lip shortly thereafter. You don't build a lasting quit based on fear.
I can't tell you how many times I resolved to "quit for good" after finding a spot on my lip or gums. Or seeing the top layers of tissue literally peel off in the morning. Once those spots went away and my mouth healed up, it was right back to the gas station for another tin. Every time.
Let that fear be a motivator to start your quit, but know that you need to get yourself in the right mindset if you have any realistic expectation of staying quit. First off, you need to understand and accept that you are an addict. You were an addict before you quit, and you are an addict after you quit. The only difference is that you aren't currently feeding your addiction. Even if you never take another pinch for the rest of your days, you will still be a hardwired nicotine addict.
Second, get your name on roll. Go to the November '16 quit group, put down your name and days quit. That is your promise not to use nicotine in any form today. We don't quit "for good" here. We quit for today and today only. When tomorrow comes, we make our promise anew and go from there. If you are a man of integrity and you get your name on roll first thing each day, I can guarantee that you will be 100% successful. Even long after the spots have healed and the fear has subsided.