Enzo Errichetti1, Angelo Piccirillo2, Giuseppe Stinco3. 1. Department of Experimental and Clinical Medicine, Institute of Dermatology, University of Udine, Udine, Italy. enzoerri@yahoo.it. 2. Department of Dermatology, San Carlo Hospital, Potenza, Italy. 3. Department of Experimental and Clinical Medicine, Institute of Dermatology, University of Udine, Udine, Italy.