This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/dth.13401. Therapeutic and etiologic considerations related to blood group and triggers in psoriasis – a Retrospective study Jacopo Scala 1 , Michael Tirant 2,3 , Mohammad Jafferany 4, Mohamad Goldust 5 , Roxanna Sadoughifar 6 , Torello Lotti 1 1 Institute of Dermatological and Regenerative Sciences, Florence, Italy 2 University of Rome, “G. Marconi”, Rome, Italy 3 Psoriasis Eczema Clinic, Melbourne, Australia 4 CentralMichigan University, Saginaw, MI 48603 5 University Hospital Basel, Basel, Switzerland 6 Bidar Skin Center, Tehran, Iran This article is protected by copyright. All rights reserved.