Objective To quantitatively document the presence and extent of a late luteal (premenstrual) acne flare in adult women.
Design Case series.
Setting Subjects were recruited from a general community dermatology practice and by advertising.
Subjects Adult women 18 to 44 years old with normal periods who were receiving no treatment for their acne.
Main Outcome Measures Acne lesion counts were surveyed over the follicular and luteal phases of 2 full menstrual cycles.
Results Most (63%) of these women showed a 25% premenstrual increase in the number of inflammatory acne lesions.
Conclusion This is the first quantitative documentation of the presence and degree of premenstrual acne flares in adult women.