Abstract: Pityriasis versicolor is a disease caused by the Malassezia fungus with general symptoms in the form of hypopigmented, hyperpigmented, or erythematous spots. Pityriasis versicolor is often found, especially in tropical areas. This study aimed to determine the characteristics of skin spots suspected of pityriasis versicolor in inmates at the Class IIA Tuminting Manado Correctional Institution. This was a descriptive study with a cross-sectional design using quantitative methods. The results obtained 30 male inmates who had skin spots and were suspected of pityriasis versicolor. Skin lesions were most common in those aged 25-44 years (37%), level of education, namely high school (40%), the residential capacity of the inmates did not meet the requirements of 5.4 m2/person, hypopigmented lesions (90%), without complaints of pruritus (63%). The location of the lesions occurred in the body area (57%), combined areas (23%), and extremities (10%). Based on Wood's lamp and microscope examination, the overall examination results were negative (100%). In conclusion, skin spots suspected of pityriasis versicolor in inmates were negatively tested, therefore, it was confirmed as not pityriasis versicolor. Keywords: pityriasis versicolor; skin spots; penitentiary; Wood's lamp Abstrak: Pitiriasis versikolor adalah penyakit yang timbul disebabkan oleh jamur Malassezia dengan gejala umum berupa bercak hipopigmentasi, hiperpigmentasi atau eritamatosa. Pitiriasis versikolor sering ditemukan terutama di daerah tropis. Penelitian ini bertujuan untuk mengetahui karakteristik bercak kulit yang dicurigai pitiriasis versikolor pada warga binaan di Lembaga Pemasyarakatan Kelas IIA Tuminting Manado. Jenis penelitian ialah deskriptif dengan desain potong lintang menggunakan metode kuantitatif. Hasil penelitian mendapatkan 30 orang warga binaan laki-laki yang mempunyai bercak kulit dicurigai pitiriasis versikolor. Bercak kulit terbanyak ditemukan pada warga binaan usia 25-44 tahun (37%), memiliki tingkat pendidikan SMA (40%), kapasitas hunian warga binaan tidak memenuhi syarat 5,4 m2/orang, warna lesi hipopigmentasi (90%), tidak ada keluhan pruritus (63%). Lokasi lesi terjadi pada area badan (57%), area kombinasi (23%), dan ekstremitas (10%). Berdasarkan pemeriksaan lampu Wood dan mikroskop, hasil pemeriksaan keseluruhan negatif (100%). Simpulan penelitian ini ialah bercak kulit dicurigai pitiriasis versikolor pada warga binaan dengan hasil pemeriksaan negatif sehingga dinyatakan bukan pitiriasis versikolor. Kata kunci: pitiriasis versikolor; bercak kulit; lembaga pemasyarakatan; lampu Wood