In Reply to: ive never had a problem posted by Cath hearts Bali on Thursday, 23. June 2011 at 12:27 Bali Time:
Because they put black hair dye in it which is not meant to be left on the skin. Only took 2 times for my reaction to hit. Had to have the tatt scraped off my ankle in the medical centre, lots of pills and of course couldn't go near water for the whole trip.
Years later, not thinking, I got a light brown colour put through my hair and my whole head had a reaction/infection. Same ingredient PDD. Not just in hair dye though. It (or similiar ingredient) found in sunscreen, some local anaesthetics, rubber.. The more the body is exposed to it the greater the reaction and apparently can do some real damage to the body.
I think it is best to stay away from them unless you know they are just pure henna, not black looking.