Small red bump w/black/dark-red spots in mouth?

I just found a small red bump in my mouth right underneath my rear molar tooth. its circular and round, and no more than 1-2mm. But it has dark-red/black on it. I do chew tobacco however. Does anyone know if this is a common cancer sign, or some other gum disease? (if it doesn't go away in a week or 2 I'm... show more I just found a small red bump in my mouth right underneath my rear molar tooth. its circular and round, and no more than 1-2mm. But it has dark-red/black on it.
I do chew tobacco however. Does anyone know if this is a common cancer sign, or some other gum disease? (if it doesn't go away in a week or 2 I'm going to the doctor)
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