Somewhere on this site Dizz I read where a lady’s husband carried a bottle of lubriderm with him to radiation therapy and slathered it on after every treatment. His wife said it really minimized his discomfort during his treatments. You could ask them if it’s OK.

SSC Lt sublingual tongue; Age 62
Positive biopsy 20June2019
Staging done 2 Jul : Stage 1
Quit smoking 15 years ago; not a drinker; no HPV
Pet/ CT 6Jul2019 : Negative. Not even the Lt tongue lit up.
Partial Glossectomy 22Jul2019