Someone please explain it

I’m a 20 M and every once In a while I will seemingly go from almost clear skin to absolute nightmare acne without reason. I never have any drastic changes in my diet, always maintain my skincare and cleanliness, it’s almsot never during a stressful period, and I’m very good about my hydration. It truly feels unprompted and it won’t just be my face it will be my back and shoulders as well. Can someone please help explain and prevent this?

submitted by /u/DirtExact2109
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