lump in mouth

Finished treatment in March this year, my last chemo was on 1st Nov 2006. I suffered with mouth ulcers whilst on chemo and now have a small lump under my tongue, my dentist is referring me for a biopsy.Obviously I am hoping it will be a cyst or something harmless and wondered if it could be caused by chemo. Has anyone else had anything like this, I am trying to remain calm about it but getting increasingly worried.

Love Lisa x