If they look like white little blisters that are filled with liquid I have a likely explanation. These can be minor salivary glands that are trying to do their job and do not have the correct plumbing yet. You are getting them when you eat and afterwards they disappear.
I had them too and it concerned me as well. As always, talk to your physicians.

Best

M

Partial glossectomy (25%) anterior tongue. 4/6/07/. IMRT start @5/24/07 (3x) Erbitux start/end@ 5/24/07. IMRT wider field (30x) start 6/5/07. Weekly cisplatin (2x30mg/m2), then weekly carbo- (5x180mg/m2). End of Tx 19 July 07.