What did you do to help radiation burn?

After lumpectomy & lymph node removal (margins & nodes showed no cancer) I had 15 rounds or radiation in 3 weeks. At the end of treatment two weeks ago I developed a rash on my chest from the radiation. It’s very red & itches like crazy, which makes it hard to sleep. I’m using over the counter cortisone cream & Aquaphor for the dryness. Has anyone had success with other ways to treat this while waiting for it to heal? This site has helped me tremendously so thank you to everyone!