Just going to share what's finally working for me. I've been on this journey for a few years and some times I would think I got rid of it but it always crept back up somehow. After a long time and lots of prayers I'm finally clear. I have hyperpigmentation but I don't care too much bc I'm just happy my cystic acne is gone and my face is smooth, it's truly a miracle. I had these cysts that would come up anywhere ranging from my forehead to my jawline, the painful kind that last weeks. The kind u feel when u smile or yawn aka most depressing kind of all. I could spend 10 paragraphs talking about all the products and diets I've done but I'm just going to tell u my regimen now and I'm clear. 
Vitamin regimen--25 billion strand probiotic 3x a day, super b complex 2xday, L lysine 3x day, evening primrose oil 3xday and sometimes I take dim plus in am but I haven't been persistent. 
Diet--paleo, no sugar, no dairy. Sometimes I might drink juice but pretty much only water. 
Cleansing method---here's the crazy part. Nothing. Water only washing sometimes with a warm rag bc my brain is still obsessed with the fact that my pores might get clogged. 
Moisturizer- fresh capsule of evening primrose oil every night and sometimes during the am or day. 
Hope this helps someone out there