You are seeing a 7 year old in the ER, his dad brought him w…
You are seeing a 7 year old in the ER, his dad brought him with concerns of a diffuse, non-itchy, painless rash. He has never had a rash like this before and other than a recent cold that he has recovered from he has been feeling well without sick symptoms. His exam is only significant for multiple discrete, nonblanching pinpoint (1-2 mm) red-purple macules densely covering his face, chest and back, with a few seen on his arms and legs and several 3-4 cm areas of subcutaneous purplish discoloration on his shins and knees. His labs show: WBC 7.6 with normal differential, Hct 38, platelets 12,000, smear shows giant platelets (megakaryocytes) with otherwise normal cell morphology. PT 13.6 and PTT 37.5. What is the most likely diagnosis?
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