See a dermatologist.
SkincareAddiction
A lemmy community for skincare enthusiasts.
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- Be kind (to yourself and others)
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Topical zinc helped me.
Some people react poorly to certain foods. I get zits any time I eat deep fried potato (no, it's not because I'm "touching my face"). Had a coworker who would break out from chocolate. It's not a dose response thing for me because I react from even a small amount. At least it doesn't last as long as when I was a kid. But for you, just remember that cystic acne takes a long time to heal so you'll have to cut things out for longer periods. And yes acne is absolutely a hormonal thing as witnessed by puberty and menstrual cycles but there can be additive things (personally I'm not convinced that there aren't endocrine disruptors in deep fried potatoes).
Eat at least 30 different fruit/veg in a week and exercise regularly and maintain a hygienic lifestyle. Also consider that you might be reacting to your toothpaste if it's only on your chin.
Edit: here's a source for the 30 veg thing, it's actually 30 "plant foods".