Lumpectomy and inverted nipple

I am recovering from lumpectomy done just over two weeks ago. The scar is healing well but in the words of my oncologist, I have a "huge shiner" on my breast, a large, colourful haematoma. Over the last couple of days I have been watching my nipple retract. I think it's an inverted nipple. It's very tender around the nipple area. I'm due to start radiotherapy in two weeks and am worried about the effect of radiotherapy on an inverted nipple. Does anyone have any experience of this? Can massage assist to coerce the nipple back to its former place?