For the past 2 months now, every so often I have little white bumps (they look a little like cankers) that flare up on the tip of my tongue. They are not painful but just a bit irritating. Sometimes a lot flare up and other times, maybe one or two flare up. Along with the bumps, I will get a bit of a scratchy throat. It does not hurt but like the little bumps, it just feels a bit irritating. These symptoms last anywhere from a few days to over a week. Any ideas what is wrong?