Years ago when I was about 40 I went to the dr as I had finished breastfeeding my sons a decade ago and I could still milk out white out of one breast and the other one was green. No joke it was! I had xrays and mammogram but they couldn't find out why so the GP said you just have to live with it. I was on the pill so I am not sure if that was a funny side effect on me. Since breast cancer 13yrs later, the white discharge breast was the one I had removed with a mastectomy. The other doesn't have anything much at all in the way of green discharge. Perhaps its because I am not on the pill any more or because of Tamoxifen which I now take?