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comedones

does anybody have any tips on how to get rid of closed comedones?
i've tried salicylic acid, niacinamide and tea tree but they don't seem to work. i've also been sorting out my diet and what i eat, reducing sugars, and even though a month later (it takes 30 days for your skin to renew) my skin got so much more better, it just went back to normal again, even though i didn't eat anything bad a month before.

does anyone have any (cheap) product recommendations or any natural remedies?