Petechiae

• Tiny 1-2 mm, initially purpuric, non-blanchable macules resulting from tiny hemorrhages.
• Purpura can be differentiated from pigmented lesions by color. Pigmented lesions are usually brown in color compared with the violaceous or red color of purpuric lesions.
• Petechiae, ecchymoses, and palpable purpura do not blanch because blood has leaked outside the vessels into the surrounding skin.

• 

  Petechiae on the plantar foot in subacute bacterial endocarditis.

• 

  Widespread petechiae in Rocky Mountain spotted fever.

• 

  Petechiae in strongyloidiasis.

• 

  Petechiae in viral exanthem.