IMO there isn't something called "progesterone gyno" or "prolactin gyno". These are not scientific terms.
Read up:
http://www.endotext.org/male/male14/male14.htm
Which steroids increase prolactin isn't as cut and dry as some seem to think based on forum bro-telligence either. IIRC correctly estrogen drives up prolactin and adnrogens reduce it - tren doesn't aromatize.
Thanks for the link. I will definitely read through that web page later today when I have time. It looks like there is a lot of good information.
I should have been a little more specific with my original question. What is the likelyhood that my nipple sensitivity is from 200-400 mg of Deca per week on top of 500 mg of Test? Those are the only compounds I am running at the moment.
I am very sensitive to Test, and thought I had the Test aromatization under control via Aromasin. So, that makes me wonder if it's the Deca...but at such a low dose? And, I ran Deca alone years ago with no problems whatsoever...maybe I will just up the Aromasin slightly.