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Urticarial vasculitis. A. Skin lesions seven days after the vaccination. Erythematous lesions, with a pale center, pruritic, distributed on the trunk and extremities. Skin biopsy histological findings. B. Dermis with oedema X10. C. Superficial and deep perivascular infiltrates of predominantly lymphocytes and histiocytes with prominent extravasated erythrocytes that suggest a late vasculitis consistent with chronic urticarial rash X40.
