Small hard bumps under the skin around my nipple

Dodgerick

I was diagnosed with Invasive Lobular Carcinoma, DCIS, and LCIS in Nov 2017, DMX in January 2018 with reconstruction, radiation and Tamoxifen. My exchange surgery was September 2018. I have recently developed a soft lump (about 1" in diameter) around the area they originally found the Invasive Lobular Carcinoma. A few of weeks later I noticed small hard bumps under the skin around the nipple of the non-radiated side (I have no nipple on the radiated side as there was cancer involvement in the right nipple). Has anyone experienced anything like this? I saw my doctor and he is ordering MRIs. I'm not sure what is going on, but I get very nervous/scared when something new like this happens.