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Am J Contact Dermat. 1996 Mar;7(1):38-40.

Occupational immediate-type hypersensitivity to henna in a hairdresser.

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Department of Occupational Dermatology, Free University Academic Hospital, Amsterdam, The Netherlands.


A case of a hairdresser who developed an immediate-type hypersensitivity with urticaria, rhinitis, and bronchial asthma on exposure to henna is reported. Prick tests with henna 1% in aqua and in ethanol showed positive reactions. Both patch tests and prick tests performed with the dye in henna, lawsone, or 2-hydroxy-1, 4-naphtoquinone, which is supposed to be an allergen, had negative results. These results suggest that not only 2-hydroxy-1,4-naphtoquinone but also other still undetermined ingredients of the henna powder should be considered as possible allergen(s).

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