Echoing raster — are you having any dairy? any yogurt?
I had forgotten to buy yogurt for a week and my skin got very clear of acne. Then next time I bought yogurt, I ate half the tub in one day because I missed having it. The next morning I had two HUGE cystic pimples. I don’t even get that type of pimple normally!
I immediately cut out the yogurt and I haven’t got any new acne since. I don’t recommend yogurt for this diet, there are other ways to get probiotics!