Why temporary tattoos have the FDA worried

Some beachside kiosks are using "black henna" infused with a banned chemical

Temporary tattoos might leave more permanent damage.
(Image credit: ThinkStock/Hemera)

Temporary tattoos are supposed to be a lighthearted and noncommittal alternative to the far more permanent inking of your flesh. As such, temporary tattoos usually aren't dangerous — they're a flight of whimsy, after all. But a certain type of "black henna" being used in some temporary tattoos has led to an usually high number of allergic reactions across the country.

According to a Food and Drug Administration news release, the skin-staining dark ink in black henna has caused severe and long-lasting allergic reactions, including "redness, blisters, raised red weeping lesions, loss of pigmentation, increased sensitivity to sunlight, and even permanent scarring."

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PPD, which has long been banned from skin cosmetics, is sometimes used in dark hair dye and can be harmful to some people. According to Michelle Castillo at CBS News, a 5-year-old-girl who had gotten a temporary tattoo with black henna had red marks appear on her forearm for two weeks. Another teenage girl had scars form on her back where a black henna tattoo was applied, "despite the fact that she had red henna tattoos before and never had a negative reaction."

Says the five-year-old girl's father: "What we thought would be a little harmless fun ended up becoming more like a nightmare for us."

Symptoms from adverse skin allergies may not appear instantaneously, sometimes taking as long as two or three weeks to show up. If you encounter any allergic reactions from temporary tattoo ink, the FDA is asking that you call MedWatch.

Chris Gayomali is the science and technology editor for TheWeek.com. Previously, he was a tech reporter at TIME. His work has also appeared in Men's Journal, Esquire, and The Atlantic, among other places. Follow him on Twitter and Facebook.