not lead to troublesome cases of acne. 2 However, our experience in a referral center for GID has shown otherwise.Report of Cases | Case 1. A trans man in his 20s with a history of mild acne during adolescence presented with inflammatory acne with scarring in the face and chest of 4 months' duration that had not responded to topical retinoids. He had begun T therapy 6 months before (testosterone undecanoate, 1000 mg every 3 months), with adequate virilization that included facial hair growth and suppression of menses. Blood T levels were 505.6 ng/dL.He started treatment with oral isotretinoin (30 mg/d), and after 9 months, the acne had completely resolved. Three months after treatment was discontinued, the acne recurred and required retreatment with isotretinoin, 20 mg/d, which was ongoing at last follow-up with good response.Case 2. A trans man in his 20s with no relevant dermatologic history was referred for severe acne on his face and trunk and seborrhea, all of which had appeared 6 months after he began standard T treatment (testosterone undecanoate, 1000 mg every 3 months). The patient had developed secondary male characteristics, namely facial and body hair growth. His T levels after starting hormonal treatment were 496 ng/dL.He received treatment with isotretinoin, 20 mg/d, for 8 months with complete resolution of the acne but persistence of scarring. Six months after discontinuation of treatment, he presented with a new acne outbreak resistant to oral doxicycline that required retreatment with isotretinoin (20 mg, 3 times a week), which was ongoing at last follow-up with good response and tolerance.