1 Tattoo unit, Dermatology Department, Hôpital Bichat-Claude-Bernard, Assistance Publique-Hôpitaux de Paris, 46, rue Henri-Huchard, 75877 Paris cedex 18, France; Departments of Dermatology, Allergology and Venereology, University of Helsinki and Helsinki University Hospital, 00029 Hus, Finland.
2 Departments of Dermatology and Infectious Diseases, Centre Hospitalier Intercommunal de Fréjus-Saint-Raphaël, 83600 Fréjus, France. Electronic address: del-giudice-p@chi-fsr.fr.