N Kluger1, C Segretin2, M-H Jegou3. 1. Departments of dermatology, allergology and venereology, Helsinki university central hospital, university of Helsinki, 00029 Hus, Finlande. Electronic address: nicolas.kluger@hus.fi. 2. Laboratoire d'anatomie et cytologie pathologiques, 23, boulevard Franklin-Roosevelt, 33400 Talence, France. 3. Cabinet de dermatologie, 8, rue Jules-Ferry, 33290 Blanquefort, France.