question: Hi. I am 32 years old and as of 3 weeks ago a smokeless tobacco user.  I have developed a sore/ulcer on my gums under my bottom teeth.  It is not overly painful and seems to be slowly going away.  Is this anything I should be worried about.  I know it is from the repeated use of smokeless tobacco, but does not seem to look like any of the pictures of oral cancer I have seen online.  Just a small open sore.  I have been told that in a week or so time these usually go away, but I just thought I'd seek some professional advice.