You should read Dr. Pagano's book.
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Irritants for people with psoriasis include dairy, peanuts/peanut butter, gluten, tomatoes, alcohol, smoking, eggplant, and peppers. You have to experiment and see what triggers your psoriasis. Keep a food diary. If you flare or get new spots, you can look at what you ate over the past few days and try to narrow it down.