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.

63 Table 1. Prevalence of onychomycosis in patients with nail psoriasis according to the literature The figures given are summarised from research results and reflect the variability in the prevalence of onychomycosis in patients with nail psoriasis depending on the study design and diagnostic criteria used. These data are not the results of our own clinical research. Table 2. Diagnostic methods for assessing nail damage in patients with psoriasis and onychomycosis Method Diagnostic capabilities Advantages Limitations Clinical observations Clinical examination Assessment of morphological changes Accessibility Low specificity Insufficient without laboratory confirmation Dermatoscopy Detection of psoriatic patterns Non- invasiveness Subjectivity Auxiliary method Direct microscopy Detection of fungal elements Speed Quality of sampling Minimum standard Cultural examination Identification of the pathogen High specificity Duration Gold standard PCR – diagnostics High sensitivity Speed Limited availability Promising method Nail ultrasound Assessment of the thickness of Non- invasiveness Availability of equipment Useful for differential Author/year Country/region Type of study Prevalence of onychomycosis, % Klaassenetal., 2014 [8] Europe Systematic review 18 – 35 Gupta et. al., 2021 [9] Canada Literature review 22 – 33 Bozdemir et al., 2022 [10] Europe Narrative review 20 – 30 H. M. Abdo et al., 2024 [11] Europe Literature review 21 – 37 Liu M., 2025 [12] Europe Consensus / recommendations up to 30%