Department of Rheumatology and Immunology of Education Key Laboratory of Child Development and Disorders Clinical Research Center for Child Health and Disorders(Chongqing) International Science and Technology Cooperation base of Child Development and Critical Disorders’s Hospital of Chongqing Medical University 400014;
Chongqing Key Laboratory of Child Infection and Immunity’s Hospital of Chongqing Medical University 400014;
Juvenile dermatomyositis; Skin ulcer; Anti-nuclear matrix protein 2 antibody; Case report;