Henna may cause allergic reactions

[FILE] An Indian woman gets her hand decorated with traditional design using henna paste. (AP Photo/Rajesh Kumar Singh)

March 26, 2013 9:59:57 AM PDT
Temporary henna tattoos may cause long-lasting allergic reactions, according to a new Food and Drug Administration report.

Researchers point to an ingredient in the longer-lasting black henna tattoos, a hair dye known as PPD. Doctors say it could cause redness, blisters, lesions, or even permanent scarring.

The FDA says reactions from PPD can occur immediately after a henna tattoo is applied or take up to three weeks to show.