I don't think you should be extremely frightened as long as you are doing something about it. It reminds me of a fibroma I had in my mouth. Fibromas can be anywhere in the body, and can be on the tongue. They are usually the result of irritation. The ENT did not want to remove mine because he said, "all you do is create more scar tissue," but this is someone who has had surgery on their tongue, radiation in their mouth so perhaps that is why. If it is a fibroma, it can get smaller when it is not irritated. Google "oral fibroma" and see if you don't think they are similar. Smooth, pink, or whitish surface, etc. Also, they should be soft to the touch. I think you are wise to follow up on it--let me clarify, I'm not saying it is a fibroma, but could be something like that. Just check it out, and try to keep the fear factor down.

Best,
Anne