the neutrophilic dermatoses mainly caused by activated neutrophils and monocytes. Granulocyte and monocyte adsorption apheresis (GCAP) is a useful extracorporeal circulation therapy for removal of activated granulocytes and monocytes. In this study,GCAP was used to treat three patients with different types of GPP; the diagnoses indicated patient 1 had GPP, patient 2 had GPP developed from psori…