Thanks for your query, I have gone through your query. The tumor what you are telling can be a fibroma or lipoma or a fibrosed mucocele. This usually occurs secondary to lip biting or chronic irritation. Consult a good oral physician and get it evaluated. The recurrence can be because of the incomplte removal in the previous surgery. Nothing to be panic, consult a good oral surgeon and get it excised. It is not because of viral infection. I hope my answer will help you, take care.