backgound. mycosis in the geriatric population are frequent, hygienic conditions, environmental deterioration tissue tegumentario facilitates their proliferation. objective. to determine the frequency of fungal skin surface and endured the geriatric population of tunja, the etiologic agents and environmental factors, social or physiological possibly lead to its development. materials and methods. case series study. between april and august of 2007, 149 skin, hair and nail samples from 53 elderly patients in the programs ？grupo revivir？, ？edad dorada？, san josé asylum and geriatric nursing home of tunja were processed at the universidad de boyacá. direct examination of the lesions, sample culture and a survey were also carried out. results. agents involved in the development of cutaneous mycoses were candida albicans (27,78%), trichophyton mentagrophytes (12,96%), candida parapsilosis (11,11%) trichophyton rubrum (7,41%), scytalidium hialinum (7,41%) scytalidium dimidiatum (5,56%) trichophyton spp (3,70%) candida krusei (3,70%), candida rugosa (3,70%), candida tropicalis (3.70%) fusarium oxysporum (3,70%) fusarium spp (3,70%), candida guillermondi (1,85%), candida spp (1,85%) and cryptococcus spp (1,85%). the most frequent location of mycoses was interdigital (64%), followed by onychomycosis (28%), seborrheic dermatitis lesions (5%) and foot skin (3%). conclusions. our results are similar to those found in other studies in antioquia and valle, colombia, but different from what has been reported in international studies. this first report in population from boyaca suggests the need for a better dermatologic care for its elderly population.