ABSTRAK Latar belakang dan tujuan: Akne vulgaris AV merupakan inflamasi kronik pada unit pilosebasea. Beberapa penelitian telah meneliti kadar 25-hydroxyvitamin D [25 OH D] serum pada pasien AV dengan hasil bervariasi, namun umumnya rendah. Kadar vitamin D diduga terpengaruh oleh pajanan sinar matahari, letak geografis, ras/tipe kulit, dan asupan makanan, sehingga mungkin temuan di Indonesia akan berbeda daripada penelitian terdahulu di luar negeri. Penelitian ini bertujuan untuk mengetahui kadar 25 OH D serum dan hubungan dengan derajat keparahan, lesi inflamasi, noninflamasi, dan total lesi AV.Metode: Penelitian potong lintang ini melibatkan 30 subjek penelitian SP , direkrut secara consecutive sampling, terbagi rata ke dalam kelompok AV ringan AVR , AV sedang AVS , dan AV berat AVB berdasarkan klasifikasi Lehmann. Faktor risiko AV yang berkaitan dengan vitamin D pajanan sinar matahari, penggunaan tabir surya, suplementasi , jumlah lesi, dan kadar 25 OH D serum dinilai pada seluruh SP. Hasil : Median kadar 25 OH D serum pada kelompok AVR, AVS, dan AVB yaitu 16,3 9,1- 17,8 ng/mL, 12,7 9,6-15,6 ng/mL, dan 9,35 4,9-10,9 ng/mL Median pada kelompok AVR dan AVS lebih tinggi dibandingkan AVB ABSTRACT Background and objective Acne vulgaris AV is chronic inflammation of pilosebaceous units. Several studies have investigated the levels of serum 25 hydroxyvitamin D 25 OH D in AV patients with varying outcomes, but mostly decreased. Vitamin D levels are thought to be affected by sun exposure, geographical location, race skin type, and food intake, that research in Indonesia may yield different results. This study aimed to determine the level of serum 25 OH D and its association with the severity and the number of inflammatory, noninflammatory, and total AV lesions.Methods This cross sectional study included 30 patients. Subjects were recruited by consecutive sampling, grouped equally into mild, moderate, and severe AV based on Lehmann rsquo s classification. The risk factors for inadequate vitamin D such as sun exposures, sunscreen, and suplements , the number of lesions, and serum 25 OH D levels were assessed on all subjects. Results The median concentrations of serum 25 OH D in the three groups were respectively 16.3 9.1 17.8 ng mL, 12.7 9.6 15.6 ng mL, and 9.35 4.9 10.9 ng mL p |