E Errichetti1, S Pizzolitto2, G Stinco3. 1. Department of Experimental and Clinical Medicine, Institute of Dermatology, University of Udine, Italy. Electronic address: enzoerri@yahoo.it. 2. Department of Pathology, Santa Maria della Misericordia Hospital, Udine, Italy. 3. Department of Experimental and Clinical Medicine, Institute of Dermatology, University of Udine, Italy.