Patterns of purpura
Purpura is the term used to describe extravasation of erythrocytes. It is diagnosed by the failure of lesions to blanch on pressure, but there are some pitfalls of this physical sign as, in particular, tiny angiomas, such as multiple minute Campbell de Morgan spots, may be impossible to blanch using the usual technique of compression with a glass slide.
Dermatology in practice 2003; 11(4): 10–12
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