I am wondering if anyone else has been troubled with blisters on their lips? I am 6 months out of treatment for Stage 4 tonsil cancer. I had 35 radiation treatments and 2 Chemo ( Cysplatin). I started developing blisters during radiation and have had them on and off ( mostly on) since then. I had Thrush for about 4 months but finally got rid of that a month ago. I thought the blisters were connected to the thrush but now I am not sure. I constantly put aquaphor on my lips but it doesn't seem to be helping the blisters. The Drs just seem confused by it, and don't know what is causing them.