Lefty2 my radiation oncologist recommended using Glaxal base cream and to start it 3 times a day at least a week before starting radiation. I used it at least times a day during treatment. First, after my shower, right after radiation and in the evening usually just before bed. I would use it more often if my breast was feeling irritated. I would definitely discuss timing for using the cream around your radiation treatment. They likely won’t want you to put cream on just before or close to the time of your treatment.
If you live near a Costco they sell Glaxal base and it came with a large tub and a smaller tub. The smaller tub I took with me to use after treatment. It was quite handy.
Wishing you well as you go through your radiation treatments.
Strength doesn't come from what you can do, it comes from overcoming the things you once thought you couldn't. - Rikki Rogers