I have a severe burning, itching rash on my buttocks and back of my upper thighs. I have restricted my diet to vegetables and proteins, eliminating all sugars, fruit, dairy, grain, starch, alcohol, vinegar as I was diagnosed with systemic candida. I take probiotics, and many herbal tinctures. I have tried every ointment, oil, alcohol, witch hazel, gentian violet, etc., to no avail. What could be causing this?