The following is an excerpt....
BASICS
Description
- Skin lesions caused by extravasation of blood into the skin or subcutaneous tissue
- Increased fragility of capillaries or dermal support
- The resultant lesions do not blanch completely with pressure (as seen when pressing down through a glass slide).
- Nomenclature varies by the size of the lesions:
- Petechiae (<2 mm)
- Purpuric lesions (2–10 mm)
- Ecchymoses (>10 mm)
- Color determined by depth and time of onset:
- Red if superficial and of recent onset
- Purple if deep
- Deep purple, brown, orange, or blue-green with later presentations
- Nonpalpable purpura:
- Simple hemorrhage or microvascular occlusion with ischemic hemorrhage
- Generally due to a platelet disorder:
- Diminished production
- Altered distribution
- Increased destruction
- Abnormal function
- Palpable purpura:
- Generally due to vasculitis:
- Autoimmune, small-vessel leukocytoclastic vasculitis ...
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