When applied to facial skin, does estrogen ointment have systemic effects?

We examined cytological vaginal smears of 17 women before and after three months of dermal estrogen (1 g of 0.01% estradiol ointment or 0.3% estriol ointment once daily), applied to the face for dermatological indications. The mean age was 57.1 +/- 7.6 years (range from 46 to 66). Seven women had estrogenic smears (more than 10% superficial cells) before therapy. Nine women were treated with 0.01% estradiol ointment and 8 were treated with 0.3% estriol ointment. Both groups had gynecological examinations including cervical and vaginal smears before and after treatment and also monthly measurements of serum follicle-stimulating hormone, prolactin and estradiol levels. Serum hormone levels and the appearance of vaginal smears showed no significant change during treatment.