Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) are systemic autoimmune diseases that may lead to multiorgan failure due to the destruction of small- and medium-sized blood vessels. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) may exacerbate autoimmune diseases and induced vasculitis.
Urticarial vasculitis is an eruption of erythematous wheals that clinically resemble urticaria but histologically show changes of leukocytoclastic vasculitis that may be divided into normocomplementemic and hypocomplementemic variants.