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Has she ruled out diet? Always the first thing to check. Itching is a symptom not a condition, so always good to support immune and sort food first. One of the best things to offer for immune and general inflammatory conditions is spirulina. You could also offer anti-allergenic oils such as yarrow, or helichrysum. Only once the body is back in balance think of topical. But my first choice at that point is to use a hydrosol gel, with appropriate selected hydrosols. Supplement zinc and vitamin C