I have read that arimidex helps with acne better than aromisin can but they both help. Better info is on ehow.com part of I copied part of it here with link to whole story under:
Taken from a report on ehow.com
Steroid Acne Treatment
According to the Department of Dermatology, University of Pennsylvania School of Medicine, a once- to twice-daily topical application of a 0.05 percent tretinoin solution is effective in treating steroid acne. Complete clearing of the condition can typically be achieved, even if the patient continues to use steroids.