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Diascopy of urticarial vasculitis skin lesion

Diascopy of urticarial vasculitis skin lesion
(A) Lesion of urticarial vasculitis on the neck.
(B) Diascopy causes erythematous halo to disappear, revealing clinically inapparent purpura.
Reproduced with permission from: Dahl MV. Clinical pearl: diascopy helps diagnose urticarial vasculitis. J Am Acad Dermatol 1994; 30:481. Copyright © 1994 American Academy of Dermatology.
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