G Tchernev1, J W Patterson2, A A Chokoeva3,4. 1. Department of Dermatology, Venereology and Dermatologic Surgery, Medical Institute of Ministry of Interior (MVR), General Skobelev blvd. 79, 1606, Sofia, Bulgaria. georgi_tchernev@yahoo.de. 2. Department of Pathology, University of Virginia Health System, 1215 Lee Street, Box 800214,, Charlottesville, VA, 22908, USA. 3. Onkoderma-Policlinic for Dermatology and Dermatologic Surgery, General Skobelev 26 blvd., Sofia, Bulgaria. 4. Department of Dermatology and Venereology, Medical University of Plovdiv, Medical Faculty, Plovdiv, Bulgaria.