E Cinotti1, L Provvidenziale1, C Miracco2, P Rubegni1. 1. Department of Medical, Surgical and Neurological Science, Dermatology Section, University of Siena, S. Maria alle Scotte Hospital, Siena, Italy. 2. Department of Medical, Surgical and Neurological Science, Unit of Pathological Anatomy, University of Siena, S. Maria alle Scotte Hospital, Siena, Italy.