Gallo L, et al. - Due to the similarity in clinical presentation of nail psoriasis and onychomycosis, researchers examined psoriatic patients for the actual frequency of onychomycosis. In addition, they compared the frequency with that in non-psoriatic patients. In this retrospective study of 9,281 patients referred to the Mycology Laboratory from September 2003 to May 2018, the PsoGroup (patients with psoriasis) included 711 patients (59,50% female, 40.50% male, median age of 52,22±15.01) with onychomycosis prevalence of 49.08%; the Non-PsoGroup (non-psoriatic patients) included 8,570 patients (71.65% female, 28.35% male, median age of 48.51 ± 19.31 years) with onychomycosis prevalence of 51.30%. The groups were not statistically significantly different regarding the prevalence of onychomycosis. However, in non- psoriatic patients, yeasts were significantly more prevalent vs psoriatic patients.