Two boys have been treated for chemical burns after having "black henna" tattoos on holiday ... British Skin Foundation said it could cause "permanent consequences" to the skin.

Henna tattoo art is an ancient practice with profound ... artist to experiment with original details without the burden of permanent ink. Some henna artists might have a sample photo book of ...

The US Food and Drug Administration states that some people have had bad reactions to henna tattoos. It can also cause permanent skin discolouration, among other skin complications. It also states ...