Edited by Anthony Bewley, MB, ChB, FRCP, Department of Dermatology, The Royal London Hospital & Whipps Cross University Hospital (Barts Health NHS Trust), London, UK Ruth Taylor, MB ChB, MRCPsych, PhD, Department of Psychiatry, Barts and the London School of Medicine and Dentistry, London, UK Jason S Reichenberg, MD, Department of Dermatology, University of Texas Southwestern, Austin, TX, USA Michelle Majid, MD, Department of Psychiatry, University of Southwestern, Austin, TX, USA.