I have a family member with this.  It can be fungal, auto-immune or even a food sensitivity.  We’ve used natural shampoos with Tea Tree oil, or you could add some to your existing shampoo for the best way to experiment, by changing only one variable.  Lowering sugar should help if it’s fungal.  Eliminating gluten has helped in our situation too.  Stress can trigger auto-immunity with a leaky gut and a genetic tendency in a particular direction.  Hypothyroidism can cause skin problems too. Maybe start with the shampoo plus something nutritive and antihistamine, like nettle tea daily?  Drink bone broth (best homemade) for a leaky gut.  God bless you
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