I also did a ton of research on histamines and their effect on skin inflammations, and fermented foods are on the top list of things to avoid if there is a histamine sensitivity or high IgE.
I was going to mention this too. All fermented foods break me out badly, probably because of the histamine content.
But certain probiotic supplements have really helped my skin. I was taking Kirkman's acidophilus for awhile and that cleared me up a lot. Now I am taking Enzymedica Pro-Bio and it's working well too. This one is improving my digestion more than the plain acidophilus supplement.
I have to avoid bifidobacteria, FOS, and inulin in probiotic supplements. Those ingredients break me out.