What specific skin reaction is most frequently cited from direct topical contact with yarrow preparations?
Answer
Contact dermatitis
The most commonly reported adverse reaction associated with applying yarrow externally, either as a salve or a compress, involves the skin. Direct contact with the raw plant material or preparations derived from it can trigger localized irritation. This irritation manifests specifically as contact dermatitis, characterized by a distinct rash or heightened sensitivity in the area where the herb made contact. This reaction is significant enough that skin sensitization is a key focus during safety evaluations, even when yarrow is considered for use in cosmetic products. Individuals with naturally delicate skin or known sensitivities are advised to exercise caution even during casual handling of the plant in a garden setting.
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