César Magalhães, Dermatology Service, Centro Hospitalar Vila Nova de Gaia/Espinho, Porto, Portugal André Coelho, Department of Pathology, Centro Hospitalar Universitário de Santo António, Porto, Portugal Miguel Costa, Dermatology Service, Centro Hospitalar Vila Nova de Gaia/Espinho, Porto, Portugal Nuno Menezes, Dermatology Service, Centro Hospitalar Vila Nova de Gaia/Espinho, Porto, Portugal