PLE-4995

FS, a 5-year-old female, was brought by her mother due to reddish purpuric lesions on her legs. Upon physical examination, heart sounds were unremarkable. You noted that the purpura is palpable and mostly located on the legs, and there is also knee pain. She also tested positive for HLA-DRB1*07. You noted that prior to the rashes’ appearance, she had a bout of URTI. As her pediatrician, what is the most likely diagnosis for her?