Youre in good hands at Mayos!
I dont know much about proton therapy.
Fyi: For my radiation treatments, I used aloe vera gel.
I scored an aloe leaf, cut it into 4x4 blocks and kept in fridge.
As soon as I got home from radiation I would put some gel all over my radiated chest. I was home alone so I went shirtless.
Every 20-30 mins Id apply more gel.
When I had to go out and at night, I used Lily of the Desert 99% aloe vera Gelly.
After 2 weeks, my radiologist called me into his office and expressed concern. I asked him if he was concerned because there were no signs of burning.
He said yes.
I informed him of my regime. I was not using what he gave me, (Aquaphor). He was a bit surprised but I said Id rather use what God made, rather than man.
I never burned. My chest has no brown skin. It feels like a babys skin.
I also drank an occasional glass of Georges Aloe vera to work on the inside during those 30 days.
Blessings!