I'm not to sure what exaclty would be diagnosed as gyno, however, this is what I've learned from posts in this forum related to gyno. If there are lumps behind one or both nippes, could be gyno and should have it checked out by your dr.
What I'm not sure about is puffy nipps. Could it be any early form gyno, there are mixed opinions.. Ive had puffy nipes before ever doing a cycle! I'm not sure if its fat on my chest either.. My body fat is not high, so I'm actually thinking of seeing my dr about it.