We performed clinical and mycological studies on 1715 cases of dermatomycosis in Chonnam University Hospital for 3 years, from January 1988 to Dccember 1990. The resuts are sumerized as follows . 1. The incidence of dermatomycosis was 13.28% out of a t.otal of 12915 out-patients. 2. Among the age groups, the incidence rate was highest in the third deacde(22.6%). 3. The ratio of male to female patients was 1.4:1(1014:702). 4. The seasonal prevalence of dermatomycosis was highest in t,tu. simmer. 5. The incidence of dermatomycosis was Tinea pedis(29.7%), Tinea versicolor(19.8%), Tinea cruris(11.8% ), Candidiasis(8.6% ), Tinea corporis(8.3% '), Onychomycosis(7.8%), Tinea manus(7.0%)Tinea capit,is(3.6%), Tinea faciei(3.1%) and Sporotrichosis(0.4%) in decreasing order of frequency. 6. Coexisting fungal infections were found in 438 pat.ient,s(25.5% ), and the cases of Tinea manus wit.h Tinea pedis was the most common. 7. In dermatophytosis, a positive rate for the KOH mount examination was 52.4%, and a positive rate of culture on ordinary Saborauds dextrose agar media was 41.4%. 8. Trichophyton rudrum was the most, common causative orgariisn of dermatophytosis(45.9%) with Candida albicans(23.2%), Trichophyton mentagrciphtes(17.1%), Microsporum canis(8.9%), Epidermophyton floccosum(2.5%), Trichophton ferrugineum(1.2%), Microsporum gypseum(0.6% ), Trichophyton violaceum(0.4%), presenting in decreasing order of frequency.