Vulvar melanoma Radiation Treatment

I have had a partial vulvectomy 8 weeks ago and have started radiation. I have only had 5 treatments so far and I am already having effects from the radiation. Red skin, little blisters, and swelling. I use an ointment after every treatment and before bed.
Do you have any suggestions on what to use or what to do to help with these effects? I only have a total of 20 treatments but starting off with effects already is a little concerning for me. Tech says it will get way worse. She said because it was a melanoma that they have to use a higher dose of radiation.
Any suggestions are appreciated!!