Henna tattoos always get more popular in the summer, but it's important to be aware that they aren't for everyone. Black henna often contains the chemical paraphenylenediamine (PPD). People who know they're allergic to PPD, or are allergic to hair dyes, should avoid getting henna tattoos as they'll suffer from an allergic reaction that can involve blistering as well as itching and burning sensations. If you suffer from more general plant allergies you won't necessarily be allergic to henna, but should be careful nonetheless.
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