Georgi Tchernev1,2, Anastasiya Atanasova Chokoeva3,4. 1. Department of Dermatology, Venereology and Dermatologic Surgery, Medical Institute of Ministry of Interior (MVR-Sofia), Sofia, Bulgaria. georgi_tchernev@yahoo.de. 2. Onkoderma - Policlinic for Dermatology and Dermatologic Surgery, Sofia, Bulgaria. georgi_tchernev@yahoo.de. 3. Onkoderma - Policlinic for Dermatology and Dermatologic Surgery, Sofia, Bulgaria. 4. Department of Dermatology and Venereology, Medical University of Plovdiv, Medical Faculty, Plovdiv, Bulgaria.