hi i'm new to this but i have a question. i have had oral cancer twice so far. I just finished with radiation and chemo in mid january. I have had some abscess and infections that the docs have taken care of but now there is a new lump they can't figure out. they believe its either teeth abscesses or that the cancer is back again. how common is it for it to come back so soon after radiation and chemo. they also removed a large tumor from my jaw in october and removed half my tongue for the second time. i should be getting biopsy results soon but i am so worried and confused. how could this happen so soon.