Purpura
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þ Definition
 - Purpura is bleeding into the skin
 - petechiae: small purpura
 - ecchmosis: medium-sized superficial purpura
 - contusion: big, deep purpura

þ Purpura on legs:
 - leukocytoclastic vasculitis is common cause (e.g., drug 
   reaction): broken WBCs around blood vessels, no intact WBCs
 - bad causes: 
   Churg-Strauss, Wegeners, Microscopic Polyangiitis, 
   Polyarteritis Nodosa (can affect liver)
 - Big workup with CTs etc. not helpful, but careful H+P 
 - Rx:
  - remove underlying cause if found
  - treat with steroids
  
þ Purpura Fulminans
 - from DIC