Actually, for both Verbonica and LeoDaVinci...
Che was Argentinian which definitely makes him South American and O'higgins and Bolivar were Revolutionaries who liberated Chile and Venezuela/Colombia respectively from the Spanish. One could argue freedom fighter or revolutionary I guess depending from which side of the battle you are viewing the action - colonial or metropole?
As for the psoriasis...I have no earthly idea and agree with Verbonica that the question is insanely obscure...even for someone who has made a career out of studying the history of the region.
