Supplemental material JAAD-D-22-00006R3

Supplemental material of research letter called " Association of atypical skin manifestations at the onset of systemic juvenile idiopathic arthritis with difficult-to-treat disease : a retrospective multicenter study". This supplemental material includes 3 figures and 1 materials and methods.本补充材料对应题为《全身型幼年特发性关节炎（systemic juvenile idiopathic arthritis）起病时非典型皮肤表现与难治性疾病的关联：一项回顾性多中心研究》的研究快报。本补充材料包含3幅图及1份材料与方法内容。