Petechial Rash - Approach

The petechial rash is a non-blanching rash due to the extravasation of RBCs.

It can result from problems with hemostasis or vessel wall.

Remember that vasculopathy can either be inflammatory (vasculitis) or noninflammatory.

We hope this helps you reason through the patient with a petechial rash.

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Image of petechial rash from James Heilman, MD, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons