I have not found acne listed among the documented determatological side effects of Arimidex, just rashes and itching. (If your friend's doctors are dismissing it as acne, could it possibly be a rash?)
However, since hormones are effected by Arimidex, it seems reasonable that acne might occur.
Best wishes to you and your friend,
Thank you, I thought that too but she is concerned that there might be something else going on that would cause this for so long. I hope not. She doesn't think it is a rash. So, I don't know.
One additional thought: Does your friend by any chance take an iodine supplement or consume a lot of kelp? This can cause rashes.
No she doesn't. Thanks.