[Skin Concern] 2 weeks in every month, I break out in small acne areas around my nose and chin. Why is this?

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So for about two weeks my skin becomes nice and normal, free of any pimples or red spots. However it's like a weird cycle. After those clean weeks, I break out in some small pimples and dark areas. Especially in the side of my nose, next to the nostrils, and in the middle of my chin. I don't change any of my skincare methods throughout this process, so I don't understand. And I can predict the cycles really easily too. What's up with this?
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Submitted by adamraco