gyno/muscle question

[slightlyconcerned]

Hello, I am a 20 yr old male who is very thin (6'1, 165) however I have a very developed chest.  I did quite a bit of weight lifting for my chest a while back and wonder if maybe I just need to catch the rest of my body up or if I have a minor case of gyno.  My question is, how does a chest affected with gyno look when flexed??  Mine looks well built and quite good when I flex it, but still large in proportion to my arms/legs.  I should also mention I have a small lump under my right nipple, it has been there for a couple of years, my right chest does not seem larger than the left though.  Thanks for your help.