Causes of Petechial Rash - Differential Diagnosis Algorithm
Febrile, Toxic:
 • Palpable: Meningococcemia, Disseminated Gonococcal Infection, RMSF, Henoch Schonlein Purpura, Endocarditis
 • Non-Palpable: Purpura fulminans, DIC, TTP
Afebrile, Non-toxic:
 • Palpable: Autoimmune Vasculitis
 • Non-Palpable: ITP, APLS, HIT, ITP, Cholesterol embolism, Amyloidosis, Nutritional deficiency

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