<unk>  occurs more often in children than in adults, and usually follows an upper respiratory tract infection. Half of affected patients are below the age of six, and 90% are under ten. It occurs about twice as often in boys as in girls. The incidence of<unk>  in children is about 20 per 100,000 children per year, making it the most common vasculitis in children. Cases of<unk>  may occur anytime throughout the year, but some studies have found that fewer cases occur during the summer months.
Henoch–Schönlein purpura
Chronic testicular pain
Amyloid purpura
Testicular pain
Golfer's vasculitis
Hennekam syndrome
Roussy–Lévy syndrome
Solar purpura