Khalaf Kridin1, Reuven Bergman2. 1. Department of Dermatology, Rambam Health Care Campus, Haifa, Israel. Electronic address: dr_kridin@hotmail.com. 2. Department of Dermatology, Rambam Health Care Campus, Haifa, Israel; Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.