Fred, Darrell and Amy,
Thanks for helping me realize that this is probably one more of the "host of weird things" (as Darrell says)that happens after treatment ends. I guess I should know that seemingly spontaneous swelling will not be the last sudden change that is worrisome.
It also dawned on me when I read your replies that the fact that side effects are still appearing might (!) indicate that the rotten chemoradiation is still working to John's benefit even though it's officially over.
He has an appointment with the head of dentistry at the cancer hospital this morning ( on-going follow-up) so perhaps we'll get some insight there and/or he can visit the radiation nursing clinic as well.
Thanks again for your help.
Mary