I have 1 red spot on the roof of my mouth, its really sore, when I swallow it hurts, and a lot of people I know are smokers, what can this be?
Possibly and ulcer. You may have an ulcer. Any break in the lining of the digestive tract exposes the underlying layers of the digestive tract. If it is not gone in 10-14 days you should get it looked at by a physician or dentist.