thrombocytopenic purpura treatmentthrombotic purpurasecondary thrombocytopenic purpuraautoimmune thrombocytopenic purpurathrombotic thrombocytopenic purpuraimmunologic thrombocytopenic purpurachronic thrombocytopenic purpuraacute thrombocytopenic purpurapurpura fulminans symptomstreatment for purpura and petechiaeallergic purpura symptomspurpura itching