I broke down and had the mammogram today for the right nipple discharge. They came back in the room and said they saw something in the left one. I had an ultrasound and it shows a 2.5 cm cyst. I would think that is a good thing I mean just to have a cyst. But it didn't tell what is causing the nasty greenish gray discharge from the right one. I has very confused as to what will happen next if they do anything at all. Maybe a blood test for my hormone levels??