Proceedings of the International scientific and practical conference ―Current Issues in Science‖ (January 9-11, 2026) / Publisher website: www.naukainfo.com. – Dresden, Germany, 2026. – 179 p.

64 the plate, matrix, bed diagnosis Biopsy of the nail apparatus Morphological verification High accuracy Invasiveness For atypical or resistant cases Capillaroscopy Assessment of microcirculation Non- invasiveness Non-specificity Auxiliary for psoriasis Thus, none of the non-invasive imaging methods can replace mycological confirmation of the diagnosis. Instrumental methods (nail ultrasound, dermatoscopy, capillaroscopy) should be considered as a supplement to laboratory tests, especially in complex or atypical clinical cases. Discussion and results . Analysis of current scientific sources shows that nail damage is one of the most common extracutaneous manifestations of psoriasis and can be observed in a significant proportion of patients during the course of the disease. At the same time, psoriatic changes in the nail apparatus are accompanied by a disruption in the structure of the nail plate and bed, which creates conditions for the development of secondary infections, in particular onychomycosis. From a public health perspective, the burden of nail psoriasis and onychomycosis goes beyond an individual clinical problem and takes on systemic significance. Both diseases are characterized by a chronic, recurrent course, high prevalence among people of working age and a significant impact on quality of life, which determines their contribution to the overall burden on the healthcare system [13]. Patients with combined nail lesions are more likely to seek medical help, require repeat consultations, laboratory tests and longer treatment. In cases of delayed or incorrect diagnosis, this leads to prolonged periods of incapacity for work, increased direct treatment costs and indirect economic losses associated with reduced productivity, i.e. the comorbidity of nail psoriasis and onychomycosis has a significant medical and social dimension. An important aspect from a public health perspective is the role of primary care in detecting nail lesions. General practitioners and family doctors are often the first