Assertion: black henna | /r/CapableOf | produce severe allergic reactions
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text: As we describe in another article on this topic, although allergic reactions to pure henna are relatively rare, black henna can produce severe allergic reactions that make delicate skin erupt into blistering redness that sometimes leads to permanent scarring, and such reactions can spread, causing grotesque full-body swelling, itching, and skin sloughing.