Look for a thick green stem spotted with dark red which varies from three to eight-centimetres thick. Each dark red spot on the stem surrounds a hair, and large, coarse white hairs occur at the base of the leaf stalk. It can grow up to five metres tall and its sap contains toxic chemicals which react with light when in contact with human skin, causing blistering within 48 hours.
Wash the area immediately with soap and water. If you feel unwell or have a severe reaction you are advised to see a doctor.