This is exactly why you should always have an AI on hand while on cycle, dont start when you start seeing or feeling negative estro sides such as gyno because once you start feeling that tissue build up your nipple theres no turning back.. just start using the AI second you inject and dont stop till your done, why risk it? Theres no doubt thats a sign of gyno, hope your PCT was a PROPER PCT and not some shit from GNC. Its possible to reverse the gyno if its very very small but chances are slim, proper doeses of letrozal may work but that stuff is so powerful i wouldn't even touch it, it virtually deletes all estrogen from your body. Do some research on it, however, my second guess is that it may be your prolactin levels that are unstable, have you ran tren?