José Carlos Cardoso1, Georgi Tchernev2,3. 1. Dermatology Department, Coimbra Hospital and University Center, Praceta Mota Pinto, 3000-075, Coimbra, Portugal. jose.c.cardoso@gmail.com. 2. Department of Dermatology and Dermatologic Surgery, Medical Institute of Ministry of Interior (MVR), Generel Skobelev 79, 1606, Sofia, Bulgaria. 3. "Onkoderma" - Policlinic for Dermatology, Venereology and Dermatologic Surgery, 26 General Skobelev Blvd., Sofia, Bulgaria.