I've been researching a pill to reverse my pre existing gyno. I developed it about 9 years ago during a cycle I had done. Theres a few bumps behind the nipple I would like to get rid of and my and one side of my chest is a little bigger than the other obviously. I've heard several different review regarding letro. But some people say it will only block the estrogen and keep from forming gyno. And others say it has actually reduced theirs. So this is where my confusion lies. Does it work on pre existing gyno to shrink the swollen tissue?