Temporary black henna tattoos may contain a chemical called para-phenylenediamine (PPD) that can cause allergic dermatitis, eczema and even scarring, according to the American Academy of Dermatology. PPD, commonly used for black hair dye, is sometimes added to natural henna to increase the intensity and longevity of the temporary tattoo. The Food and Drug Administration prohibits the direct application of PPD to the skin because of known health risks; however, temporary tattoos are unregulated.  Read more here.

First published: Allergy & Asthma Today, Fall 2008
Reviewed:  March 2009, Laurie Ross

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