I had partial breast radiation, right breast, 7 mm ER/PR+ DCIS no nodes, intermediate grade, 68 yo at the time. Radiation was hypofractionalized 3000 Gy total, 600 a day for 5 days.
I attached a photo of the radiation pattern, more was targeted at cancer site.

I had no surface skin issues. They say I have thickened skin, but I can’t really tell. I have some lumpiness in that area, it seems to be unknown if it’s internal scar from the surgery or necrosis from radiation. There was a fair amount rearranging of the breast tissue - I had a lumpectomy and a plastic surgeon fixed it so it’s not noticeable. I’m now 71, and on 5 mg tamoxifen.