Introduction : Dermatophytes is a superficial fungal infection that affects skin, hair and nails which caused by Dermatophytoses epidermophyton, Microsporum and Trichophyton.This disease is a general healt problem skin around the world, especially at the tropical country,in thecomunities of low socioeconomic status,densely populated settlements, that their environmental hygiene is not optimal. Prison is the very risky place with the skin disease transmission especially the skin fungal disease.To find out the profile of dermatophytoses on prisoners at the Penitentiary Class I Tanjung Gusta Medan.Methods : This study is a descriptive observational with cross sectional design.The result of the study is presented in tabular form of distribution - frekuention. Subject of the study is to involve as many as 90 prisoners with dermatophytoses .The diagnosis is made by history, dermatologic physical examination, a direct microscopic examination using KOH and culture of scrapings skin, nails and hair.Results : Prisoners who suffer most dermatophytoses are in the group of age 41-45 years (24.4%),the most diagnosis with tinea cruris are 52 people (57.8%) and the most common cause is Tinearubrum amounted to 84.5%.Keywords : dermatophytoses, prisoners, penitentiary