Background
Contact allergy can be a cause of severe disease. The consequences of contact allergic reactions are often underestimated.
Case reports
We report on a 10-year-old girl, a 10-year-old boy and a 40-year-old man, who received temporary paint-on “tattoos” (temptoos) with black henna paint in Italy, Turkey or India, respectively. Both the girl and the man had a refreshment of their temptoos within two weeks after the first painting. The patients developed within 10 to 31 days after the first application of the dye an acute local contact dermatitis. The male patients also developed severe, long standing generalized vesicular and crusted eruptions, the boy had constitutional symptoms in addition. The children received systemic steroids because of their significant symptoms, and their skin lesions resolved within several weeks. The man was treated with topical corticosteroids, his dermatitis resolved also slowly within several weeks after recurrent generalized eczematous eruptions. Besides, he developed textile dermatitis when wearing black clothes. In all three patients marked post-inflammatory hypo- or hyperpigmentations were seen at the sites of the temptoos after resolution of the contact dermatitis. All three individuals had no indications of prior contact sensitization.
Patch testing with the standard series yielded a 3+ reaction to p-phenylendiamine (PPD; 1%) in the 10-year-old girl. The boy and the man were patch tested with 0,1% PPD, they developed also 3+ reactions. Furthermore, the girl showed patch test reactions to structurally related compounds.
Conclusion
We want to draw attention to the serious hazards of these temptoos. They contain PPD in such a high concentration that they can cause sensitization and manifestation of allergic contact dermatitis even after a single application. Temptoo contact dermatitis often leaves cosmetically disturbing hypo- or hyperpigmentation, sometimes even scars. Contact allergy to PPD and structurally related compounds persists for a long time, even lifelong, thus causing significant restrictions of private life and occupational possibilities.