A 65-year-old woman from Thailand was hospitalized in May 2016 with fevers and rash. The patient had end-stage renal disease and hypertension and received a deceased-donor kidney transplant in 2009. The induction immunosuppression agent was rabbit anti-thymocyte globulin, and she took tacrolimus and mycophenolate mofetil for maintenance immunosuppression. The patient was diagnosed with polymorphic, Epstein-Barr virus-positive posttransplant lymphoproliferative disorder (PTLD) of the central nervous system 5 weeks prior to admission. She completed two doses (375 mg/m 2 each) of rituximab with dexamethasone (10 to 24 mg/day in divided doses), and mycophenolate mofetil was discontinued after the PTLD diagnosis.On physical examination, the patient was ill appearing but alert and oriented. Her temperature was 38°C. The right eye conjunctiva was injected with nodular conjunctival lesions. On skin examination, there were erythematous papules, some with central pustules, on the forehead, face, neck, arms, anterior thighs, knees, and lower back (Fig. 1A). Human immunodeficiency virus antibody and tuberculosis gamma interferon release assays were performed, and both were negative. A computed tomography scan of the chest demonstrated several bilateral subcentimeter pulmonary nodules in the lower lobes and lingula.Skin biopsies were performed on the right arm, cheek, and thigh, and the samples were sent for histopathologic examination and bacterial, fungal, and mycobacterial cultures. Histopathology revealed a superficial and granulomatous reaction with a neutrophilic infiltrate involving the dermis and subcutaneous fat (Fig. 1C). Numerous acid-fast bacilli (AFB) were visualized after staining with Fite-Faraco stain (Fig. 1D). Rare AFB were observed by acid-fast fluorescent staining of tissue submitted to the clinical microbiology laboratory, and a portion of the specimen was inoculated onto chocolate agar and incubated at 30°C. Imipenem, azithromycin, levofloxacin, isoniazid, pyrazinamide, and ethambutol were administered as empirical therapy for rapidly growing mycobacterial species (Mycobacterium chelonae/Mycobacterium abscessus group and Mycobacterium fortuitum group), slowly growing mycobacterial species (Mycobacterium haemophilum and Mycobacterium marinum) that are often associated with skin lesions, and Mycobacterium tuberculosis. Aminoglycosides and rifamycins were initially avoided, given the potential for nephrotoxicity and drug interaction with tacrolimus, respectively.Two weeks after the skin biopsy, mycobacterial cultures demonstrated no growth. The skin lesions had progressed to extensive erythematous plaques and yellow/black crust covering the forehead, cheeks, both arms, and thighs. Painful ulcerations develCitation Jacobs SE, Zhong E, Hartono C, Satlin MJ, Magro CM, Jenkins SG, Westblade LF. 2018. The Brief Case: Disseminated Mycobacterium haemophilum infection in a kidney transplant recipient. J Clin Microbiol 56:e00561-17.