[Para-phenylenediamine allergic contact dermatitis due to henna tattoos in a child and adolescent population].

Introduction: Henna tattoos are a very common practice in the adolescent population. Henna is very often admixed with para-phenylenediamine (PPDA) to improve the appearance of the tattoo. PPDA is a potent allergen, and is a frequent cause of allergic contact dermatitis (ACD).