The book is the first fundamental publication devoted to this disease on the Russian market of professional medical literature, prepared by a team of authors led by the largest dermatovenereologist, head of the clinic for dermatovenereology and dermato-oncology of the MONIKI named after M.V. M.F. Vladimirsky, Head of the Department of Skin and Venereal Diseases, FPPO MMA named after A.I. I. M. Sechenov, Honored Scientist, Doctor of Medical Sciences, Professor V.A. Molochkova. The publication includes sections on epidemiology, etiology and pathogenesis, classification and clinic of various forms of psoriasis and psoriatic arthritis, clinic, pathomorphology, histogenesis, differential diagnosis and treatment of common psoriasis, as well as pustular psoriasis (generalized pustular psoriasis and pustular psoriasis of the palms and soles), childhood psoriasis. A separate chapter is devoted to psoriatic arthritis as a systemic disease (etiology and pathogenesis, pathomorphology, clinical picture, diagnosis, classification and treatment). The book also highlights the psychosomatic aspects of psoriasis, psoriasis in HIV-infected people and prevention.The publication is intended for senior students specializing in dermatovenereology, interns, dermatovenereologists in the postgraduate education system, practitioners in the field of skin diseases .