Yea, find a Research Chemical named Tamoxifen or Toremifen.. Google it you can find it.
Where'd you get the steroids? In a store? If so they should have ID'd you and denied you.. either way you should have known it was a hormonal product- a big NO-NO for people under 21.
Also, since you had pubertal gyno it might not go away. ALSO-- since you recently lost a lot of fat it COULD be fat deposits under your nipples.. maybe losing some more weight will help get rid of the problem, although it definately sounds like gyno.