Twenty women with acne vulgaris who presented to a gynecologist's office with the complaints of hirsutism, infertility, menorrhagia, or oligomenorrhea were subjected to a 24-hour cosyntropin (ACTH) infusion to detect partial 11- or 21- adrenocortical hydroxylase deficiencies. All patients demonstrated enzymatic defects and were placed on prednisone therapy. The 6 patients with moderate acne either showed improvement of their acne or conceived. Of the 14 patients with mild acne, 7 showed improvement of their acne or conceived; whereas, the remainder showed no improvement. Patients with acne and gynecologic signs and symptoms should be evaluated for the presence of 11- or 21-adrenocortical hydroxylase deficiencies.