Dengue is an acute febrile mosquito-transmitted viral disease which is endemic throughout tropical and subtropical regions around the world. Dengue leads to a spectrum of clinical presentations that comprise dengue fever, dengue hemorrhagic fever (DHF) and dengue shock syndrome. DHF usually begins with fever, rash and other symptoms resembling dengue fever. However, DHF is a potentially fatal syndrome that can evolve into dengue shock syndrome. DHF is characterized by fever, hemorrhagic tendency, thrombocytopenia and plasma leakage. Although the number of imported cases of DHF are steadily increasing in Korea, DHF has been rarely described in the Korean dermatologic literature. Herein, we report a case of DHF developed after traveling to Vietnam.