If worrying about your tampon malfunctioning, or the crippling pain of cramps wasn’t enough to deal with during your period, that stressful 5-7 days every month can also bring another unwanted visitor: a new crop of zits. Hormonal acne is one of the most frustrating skin conditions to deal with, because it has absolutely nothing to do with your skincare routine — it’s all about what’s going on in your body.