I started to feel like I had a bad canker sore and then felt the sharpness. My tongue wouldn't leave it alone and my tongue became very raw. My ENT scraped it off and put me on clindamycin for 3wks incase there was a possible bone infection. It went away for about 2-3 weeks and is now back. I hope and am reassured that it's happened to others and may possibly go away. by the was it's seems it's common about 6mo post radiation. Kathy