Vasculitis is defined as the presence of inflammation in the blood vessel wall. The phenotype and severity of vasculitis is determined by the site of vessel involvement, the size of the affected vessels, the extent of the vascular injury, and underlying pathology. It can be primary or secondary to infection, malignancy, drug exposure, and other rheumatic conditions. Primary vasculitis can be classified according to clinical manifestations, the size of the affected vessels, or histopathology including the presence or absence of granuloma. (4) HSP and KD are the most common vasculitis in children accounting for 49% and 23% of all childhood vasculitis, respectively. (5) Systemic vasculitis can be caused by viruses of which hepatitis B related
