I recommend you try Traditional Chinese Medicine (TCM). I had to drink the ugliest medicinal tea imaginable for a while, but after that my skin problems had miraculously disappeared.
This is definitely on my list in a few months if the diet changes I'm making haven't helped (I'm trying to stay in Ketosis for a few months). I studied Chinese martial arts for most of my life so some TCM treatments have worked for other things in my past.
Do you know what the ingredients were? I know some people who have creams from a Chinese medicine doctor that seem to work for them.
Unfortunately not. But I remember there was some really weird stuff in there. Anything from minerals to insect skins. It is customised to whatever the diagnosis is.