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Ecthyma gangrenosum in an infant after liver transplantation. Ecthyma gangrenosum is a rare, necrotizing, bacterial infection of the skin most commonly caused by Pseudomonas aeruginosa. It has a characteristic clinical picture starting with maculopapular eruption followed by hemorrhagic vesicle and evolving into gangrenous ulcer. Although direct skin inoculation without septicemia is also probable, usually ecthyma gangrenosum is pathognomonic for Pseudomonas septicemia, which has a mortality rate of 38-96%. Herein, we report on the case of a 9-month-old male infant diagnosed with ecthyma gangrenosum who had undergone liver transplantation approximately 6 months previously and who was under immunosuppressive treatment, in order to highlight the importance of the early diagnosis and treatment of this disease.