before you assume, I got this off of Steroid.com
"The development of gynecomastia or feminization of the breast tissue in males is possible with anabolic steroids. This is due to an excess of estrogen being present in the body, through a process known as "aromatization" whereby androgens like testosterone are converted to estrogen. This excess estrogen then finds its way to the receptors in breast tissue and binds to them. This results in the possibility of female-like breast tissue, which must sometimes be removed by surgery. Most athletes experience itchiness of the nipples, followed by pain. Since this develops over several days, usually, the athlete usually has more than enough time to discontinue the use of the compounds he´s taking, or to attempt to counteract the breast tissue development while remaining on the cycle. The two most common ways this is achieved by steroid users is either to use an anti-estrogen like Nolvadex or Arimidex in their cycle or to take Letrozole (*a very strong Aromatase Inhibitor and antiestrogenic compound) afterwards, to destroy the tissue that has developed.
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sten is an estrogen drug, but I think the dose you are doing is small enough that it won't be a problem. Just keep an eye on it. | 
