It's not good to take medications to build body...please consult nearest physician and stop medication...Gynecomastia vanishes without treatment in less than two years. But in some patients treatment may be needed if gynecomastia doesn't improve on its own..in your case if you stop medication it will definitely vanish.

Exogenous testosterone and anabolic steroids should not be used for body building as it can interferes with your natural testosterone and pituitary axis of L H hormone. One important point - any  testosterone outside source, taken converts into female hormone called estrogen which can lead to gynaecomastia. So actually u re converting ur hormone milieu towards more feminine.  Later fertility can also be affected. So refrain from these outside testosterone sources. U also need to get urself checked by nearby  endocrinologist .u need  to run few hormone test