Avoiding paraphenylenediamine exposure in children.

Although the allergenic potential of PPD is well known, it was chosen by the American Contact Dermatitis Society as the 2006 "allergen of the year" in order to increase awareness of new patterns of exposure and increasing sensitization. Temporary tattoos are a vehicle of contact with PPD that is particularly relevant to children. They are a risk not only in the United States, but in many international locations frequented by American tourist families. Adolescents dyeing their hair are also at risk. With this in mind, measures should be taken to increase awareness and avoid the unnecessary usage of PPD in children.