Most people think of Henna tattoos as a harmless ink that is applied to the skin. That is not always the case. Some Henna dyes contain paraphenayline diamine (PPD), which is the dye used in permanent hair dyes. This ingredient can result in severe allergic reactions.
In a case reported in BMJ Case, a 10-year old boy had a severe reaction to a Henna tattoo.
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