Some women report breakouts during specific times in their menstrual cycle. (WORK IN PROGRESS)
Birth control may sometimes cause acne, and sometimes it may even temporarily fix it
Palatsi, R., Hirvensalo, E., Liukko, P., Malmiharju, T., Mattila, L., Riihiluoma, P., & Ylöstalo, P. (1984). Serum total and unbound testosterone and sex hormone binding globulin (SHBG) in female acne patients treated with two different oral contraceptives. Acta dermato-venereologica, 64(6), 517–523. (edited)