worried about my other boob

Hi All
just started rads( left boob and neck ) on the17th march ( having 30 ) after WLE,ANC, 6 chemo,+18 herceptin,on the easter weekend i noticed a red patch about the size of a 50p piece on the inside of my right boob which is not painfull or hot,but dosn’t seem to want to go away, i showed the radiographer on tuesday after easter and i’m seeing doc next monday, my rads side is going pink and i thought it seems a coincidence that this has appeared since starting rads although the radiographer says its nothing to do with the rads as im only having it on my left side and to show the doc when i see her,has anyone else had anything similar?, my mind is starting to go into overdrive now worrying if it might be something sinister…
Mizzy XXX