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I am skeptical that she has staph every time her psoriasis flares. The two conditions are unrelated. Perhaps you should get another opinion, but it doesn't have to be at the equivalent of the Mayo Clinic, since both psoriasis and staph are common. Neither is serious, but what you're looking for is some clarity. If your current doctor has indeed cultured staph bacteria every time, then the diagnosis of psoriasis needs reconsideration, I think.
Best.
Dr. Rockoff