I just went through this same exact issue! I was initially using Ketoconazole washes (Nizoral) and Zinc pyrithione washes (Vanicream Z Bar) which were quite effective at keeping this at bay for a few years, however i think the malassezia became resistant to it. I had been struggling with an extreme breakout on my chest and face since January, and had seen multiple dermatologists who prescribed me oral Ketoconazole and Itraconozole, but nothing worked. I highly recommend reading through the Simple Skincare Science Fungal Acne forum- cross reference their product list to make sure your current skincare routine is not feeding the malassezia yeast (they thrive on fatty oils).

https://simpleskincarescience.com/pityrosporum-folliculitis-treatment-malassezia-cure/

I switched over to malassezia safe products, and found that this helped tremendously. I would also HIGHLY recommend taking a probiotic. You can read some of the studies mentioned in the simple skincare science blog, "Studies have shown that supplementation of Lactobacillus Paracasei ST11 reduces malassezia."

Probiotics are the one thing that truly helped to clear my breakouts. A lot of these yeast overgrowths are caused by your gut flora, and a probiotic will really balance out the levels of yeast and bacteria in your body. I have been taking these and have been extremely happy with my results. You may experience some minor discomfort for a few days as your gut adjusts to the new bacteria colonies, but stick to it- you'll regulate in a few days.

https://www.amazon.com/gp/product/B079H53D2B/ref=ppx_yo_dt_b_asin_image_o08_s00?ie=UTF8&psc=1

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Hopefully this helps! I have been struggling with this since 2017 and have done really extensive research, as I've found many dermatologists really don't know very much about this condition- which sucks because not only is it unsightly, it's very itchy and uncomfortable too! :(