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A 6yo girl presents with palpable purpura of both legs for 2 days. She has not had any fever and is well appearing. Her labs, including CBC, electrolytes, BUN, Creatinine, and ESR are normal. She does not complain of any pain. Her vital signs are temperature 37.5 C, HR 90, RR 20, BP 90/45. She has no abdominal tenderness, vomiting, respiratory difficulty, joint pain or swelling, and her urination has been normal. Her stool guaiac is negative.