Jana Kazandjieva1, Nikolai Tsankov2, Razvigor Darlenski2,3. 1. Department of Dermatology and Venereology, Medical University Sofia, Sofia, Bulgaria; janaderm@abv.bg. 2. Department of Dermatology and Venereology, Acibadem City Clinic Tokuda Hospital, Sofia, Bulgaria. 3. Department of Dermatology and Venereology, Medical Faculty, Trakia University, Stara Zagora, Bulgaria.