Airborne allergic contact dermatitis caused by a henna stone.

Henna stone is a lesser-known commercially available material used to obtain black henna paste (1). In some countries, including Turkey, local herb sellers sell it as ‘natural stone’, a so-called natural source for black henna. The stone has to be crushed into powder first, and then mixed with water, hydrogen peroxide and, sometimes, natural henna to obtain black henna paste for the purpose of hair dyeing or, mainly, temporary tattooing (1). We herein present a unique case; a teenager who developed an unusual airborne contact dermatitis while trying to crush a henna stone outdoors on a windy day.