Acne can come on anytime there is a change in hormone levels so it is common both going on and coming off of cycle. High estrogen can cause it, but other hormone levels being off also causes it, so it is not directly estrogen related
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The androgenic effects of anabolic steroids cause the sebaceous glands in the skin to secrete more oils than normal. This also occurs in puberty for much the same reason; additional hormones during puberty cause oilier skin. However, in athletes, it is important to consider that working out also increases oil production, which causes acne to worsen very quickly. Most steroid users notice oily skin followed by blemishes on their backs, shoulders, and faces.