SymbolWatanabe, Y.Yamaguchi, Y.Komitsu, N.Ohta, S.Azuma, Y.Izuhara, K.Aihara, M.Author informationThis summary relates to DOI 10.1111/bjd.14426Linked Article: Watanabe et al. Br J Dermatol 2016; 174:1327–1336.British Journal of Dermatology 174(6):p e91, June 2016.Copyright © 2016 British Association of Dermatologists