Pustular psoriasis is one of the more serious types of psoriasis, which may be caused by genetic factors, environmental factors, immune factors and so on. 1. Genetic factors: Pustular psoriasis belongs to a kind of polygenic genetic disease, there is a certain genetic background of genetic defects, with a certain genetic risk. 2.Environmental factors: Environmental factors play an important role in the triggering and exacerbation of the disease, such as infections, mental stress, drugs, stressful events, pregnancy and so on. 3.Immune factors: The disease is a chronic inflammatory disease caused by abnormal activation of T cells, infiltration and excessive proliferation of keratin-forming cells. Pustular psoriasis may also be caused by other reasons, it is recommended to consult a doctor in time, under the guidance of the doctor for proper treatment. Patients are advised to keep the lesion area dry and hygienic on weekdays, pay attention to protect the skin and avoid trauma.