Psoriasis is related to the systemic diseases characterised by a complex of mutually conditioned pathogenetic links (immune, neuro-endocrine, infectious, etc.). Microbiocenosis of both healthy and pathologically altered skin can serve thepoint to assess the health of macroorganism. In chronic dermatoses a qualitative
and quantitative change in skin microbial associations is observed. Changes in macroorganismare reflected in disorders of microbial landscape of all skin topographic zones. It should be noted, that the study of microbial skin flora in psoriatic patients is episodic and unstructured. Despite loads of suggested
methods and therapeutic means used to treat psoriatic patients, their efficacy remains not high due to the uncertainty of aetiology, disease pathogenesis multi-factority and polymorphism of clinical manifestations. The purpose of our study was to study changes in microbial flora of psoriatic patients skin under NBUVB application