I know this is a little bit older of a post, but jbms, if you get a chance you really should have it checked out as soon as possible. It could be nothing, but my tongue cancer started out as a series of recurring (or at least what I thought were recurring) canker sores. It wasn't a canker sore obviously, but the pain came and went so I thought that it was healing in between. They put me on antibiotics at first and all of the red irritated part went away except for a small white patch. I know oral cancer isn't supposed to decrease in size but I swear that mine did. Right before I went in to get my biopsy (to try to calm myself down) I was thinking to myself "gee, thank goodness my sore is less raised right now than it was two days ago, because like people have reassured me, cancer doesn't do that." So go get it looked at just in case. Even if it is smaller now than it was, if you still have it and have had it longer than 2 weeks, go get it checked out. I wasn't expecting it to be cancer but luckily freaked myself out enough by using Dr. Google. I'm glad that I did in this situation!