Most pills contain a combination of an estrogen and a progestin. These two hormones are what contribute to and control the mesnrual cycle. OCPs attempt to mimic this cycle in such a way that prevents ovulation (release of the egg). The progestins that are found in OCPs have variable androgen (male type hormone) effects. Some OCPs can even worsen acne, however ones that include certain progestins may even fight the androgens and thus help acne.
of birth control
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