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Reactive angioendotheliomatosis (RAE) is a rare benign skin condition characterized histologically by the proliferation of dermal vessels and endothelial cells that occurs secondary to an underlying disease such as infections or lymphoproliferative disorders. To our knowledge, no previous cases of RAE associated with ulcerative colitis (UC) were reported in the literature. Therefore, we report the case of a 46-year-old man with a history of UC presenting with RAE confirmed on histopathology and immunostaining.