My groin area feels very swollen.

I’m 69 years old and was diagnosed with prostate cancer on May 18th, 2024 after results from my biopsy! On July 1st received an injection of Lupin radiation started 3rd week in August 28 treatments. I see my oncologist on the 30th of December. This is really the only strong side effect I’m having but it’s a problem. Anyone else having or had this issue.