purpura fulminans symptomstreatment for purpura and petechiaeallergic purpura symptomspurpura itchingsenile purpura symptomsthrombocytopenic purpura treatmenthenoch purpura symptomspurpura rash treatmentpurpura fulminans symptomesthrombo thrombocytopenic purpurapetechiae skin purpurahenoch schonlein purpura symptoms