How in the world could any doctor who has not treated you or seen your records even attempt to say the biopsy will be cancerous? A biopsy is the only way to tell if it is cancer or not. Please dont pay any attention to info a doctor gave to your friend. Im surprised a doctor would even comment on something like this without seeing you first.

Different doctors recommend different options. Thats why second opinions are so important. It is very important that you would be seen at a cancer center where they are familiar with head and neck cancers. Better to be seen by a doctor who sees hundreds of cases per year vs one who sees a case or two per year.

Hope it turns out to be swelling from your treatments. It does take time for it to go down. Do you know exactly what is being biopsied? Best of luck with everything.