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Granulomatosis with polyangiitis (GPA), formerly known as Wegener granulomatosis is a rare condition that targets the arteries, veins and capillaries of the kidneys and the respiratory system.

Henoch-Schonlein purpura causes a purple spotted skin rash which lasts around one to four weeks, and is often marked by relapses.

Hives (urticaria) are a reaction to the release of histamine into the skin.

Erythema nodosum appears as red tender lumps, most commonly on the shins.

Some children acquire a heart problem after an illness in childhood, and this is called an acquired heart defect.

The immune system remembers every germ it has ever overcome.

Stroke is rare among children and babies, but it can occur.