[Morphology and pathogenesis of psoriasis].

Data from the literature on morphological features of foci of lesions on the skin which is the main target of the pathological process in psoriasis are presented as well as the materials confirming the systemic nature of the disease. The important role of immunopathological responses in the pathogenesis of psoriasis is emphasized. Viruses, congenital defects in the immune regulatory system, cellular membranes of the epidermis, blood and lymph vessels are discussed as possible etiological factors. The morphology of regression of psoriatic foci of lesions under the influence of photochemotherapy is described.