The androgen excess in women with acne can play an important role in gynecological endocrinology. LH, FSH, PRL, Testosterone (T), Androstenedione (A), Deydroepiandrosterone sulphate (DHEA-S) and Progesterone (P) were investigated in 21 women with uncomplicated idiopathic acne during the menstrual cycle. LF/FSH ratio greater than 3 was found in 7 cases (36.8%). Total T values were high in 90.4% of the whole group of women with acne (mean +/- SD 618.6 +/- 253.6, normal range 92-352 pg/ml). An ovulatory pattern of P was found in 66.65% of women with acne. Hyperprolactinemia was found in 23.6% of cases. The common denominator for ovulatory dysfunction in these women seems to be elevated LH levels, rather than elevated T levels.