Ethinylestradiol/cyproterone acetate is used to treat skin conditions such as acne, very oily skin and excessive hair growth in women of reproductive age. These include patients with polycystic ovary syndrome, who require treatment for these symptoms. DIANE-35 is a hormonal contraceptive. Due to its contraceptive properties it should only be prescribed for you if your doctor considers that treatment with a hormonal contraceptive is appropriate as well.