Hi Eastmum. I didnt have chemo or rads since I had noninvasive DCIS. I had a single side mastectomy and only sentinel nodes taken, and I definitely had the exact problem you are experiencing in both armpits. I had given up wearing deodorant about 15 years earlier as I never needed it. The good news was that the problem sorted itself out a few months after the exchange surgery. I also had a fishy issue down below that I had never ever had before. I think it must be some sort of hormonal upset to do with the trauma to/ removal of the breast tissue as I m not on any hormone drugs either so there are no exterenal factors I can blame other than the surgery. x