The Federal Drug Administration says henna tattoos can be dangerous.There has been an increased amount of people reporting bad reactions to the ink. These reactions include rashes, blisters and lesions. Researchers say if you plan to get a henna tattoo, ask about the ink. If you have a reaction, go to the doctor immediately. Reactions are usually treated with a topical steroid.
Black henna is typically used in temporary tattoo kiosks on beaches, board walks and some specialty shops.