I've had this same lump in my tongue for 4 years. I went to a oral surgeon over 3 years ago. He didn't know what it was, but he took it out (which was so painful). He did a biopsy on it and it was non cancerous. Within a few months it was back. I still don't know what it is but it is annoying and I find myself biting my tongue more often because its in the way. It doesn't seem as though anyone has had any clarification of what this could be.