Thanks everyone. I had the repeat diagnostic mammo and also an ultrasound. Result is clusters of small cysts--harmless--in each breast. So nothing to worry about at all! I don't know why my breasts have grown all these little cysts in the last year--it is not new machinery. They said that after I go through menopause (not there yet), these cysts will probably not occur.

So the good news is everything is fine!