10 years post radiation--breast changes

I had lumpectomy, chemo and radiation 10 years ago. My breast has been slightly smaller and denser since treatment but not terribly noticeable. Since then I've had 3 more biopsies on that breast (all benign, thankfully!). I've noticed in the last year that my breast has shrunk significantly and become much, much more dense/hard. The skin is thicker and my lumpectomy scar is actually more noticeable now with these changes. My last mammogram showed some rather large calcifications (biopsied and benign).

I'm wondering if other women have had significant changes like this so long after treatment? Did you try anything to help the tissue loosen back up? Was your doctor concerned? Mine seems not to be.