Hi I have this kind of dark red nearly black perfect round spot in the inside of my right cheek. It doesn't hurt in the slightest.. it's about 4mm in diameter and is no different in feel than the lining of my inner cheek. I smoke and I am hoping it is not early stages of mouth cancer but after viewing pictures on the web of oral cancer it looks completely different. I felt it today by chance with my tongue after eating a meal. I used my tongue to remove a bit of food from my back teeth and felt this lump... When I looked in the mirror I nearly fell through the floor. I couldn't believe my eyes what I was seeing in my mouth. I have had no sexual contact whatsoever for a long time.. 1 yr maybe, so it's not sexual I am positive. Please experts or anyone.. give me some advice