Abstract Disclosure: H. Tovar Cortes: None. I. Title Cutaneous manifestations in adults with gender dysphoria under treatment hormonal in external consultation of the Hospital de san José , Bogotá .Colombia II. Authors Dr. Manuel Fernando Ortiz Castañeda1, Dr. Henry Tovar Cortes2 , Dra. Nicolle Guiot Isaac3, Dra. Carolina Morales Cardenas3, Dr. Carlos Jimenez4 1. Dermatologist and Instructor or Professor (Assistant, Associate) of the Department of Dermatology Fundación Universitaria de Ciencias de Salud - Hospital de San José de Bogotá 2. Endocrinologist and Instructor or Professor (Assistant, Associate) from the Department of Endocrinology Fundación Universitaria de Ciencias de la Salud - Hospital de San José de Bogotá 3. Third-year residents of Dermatology Fundación Universitaria de Ciencias de la Salud - Hospital de San José de Bogotá 4. Fellow of Endocrinology Foundation University of Health Sciences - Hospital de San José de Bogotá III. Introduction : Comprehensive health care for patients with gender dysphoria includes Access to gender affirmation hormone therapy. It can have skin and annex side effects, which often affect quality of life, are underdiagnosed and not treated promptly. Literature on the subject is scarce. Objective: To determine skin manifestations secondary to hormonal treatment in adults with gender dysphoria. IV. Methodology: Cross-sectional descriptive observational study. A search was carried out in the database of patients with gender dysphoria over 18 years of age, treated in dermatology and/or endocrinology clinic of the San José Hospital of Bogotá in the period 2015-2021. The clinical records of patients who were in hormonal therapy with skin manifestations were selected, patients who used other drugs as possible triggers were excluded. Sociodemographic data, skin manifestations, evaluation by specialists and treatment received were analyzed. V. Results : 85 patients were included, predominantly young transgender men in whom the main manifestation was acne (90%), followed by androgenetic alopecia and acanthosis nigricans. Transgender women presented more acne, androgenetic alopecia, seborrheic dermatitis and melasma. More than half of the patients were seen by endocrinology and dermatology, receiving mainly topical treatment. VI. Discussion and conclusion: Skin manifestations in patients with gender dysphoria in hormonal therapy are frequent, so they should be known and taken into account in the multidisciplinary approach of these patients, including the participation of a dermatologist. VII. KEYWORDS: Gender dysphoria, Gender identity, Gonadal steroid hormones, Testosterone, Estrogens, Estradiol, Antiandrogens, Androgens VIII. ADDRESS - CONTACT Dr. Henry Tovar Cortés Mail: htovar@fucsalud.edu.co Contact number: 3158849232 Correspondence address: Carrera 18 9-18 , office 103 Presentation: Saturday, June 17, 2023