Clinical analysis of generalized pustular psoriasis in Chinese patients: A retrospective study of 110 patients

Generalized pustular psoriasis is an immune‐mediated dermatologic condition characterized by widespread, sterile, subcorneal pustules. However, limited information exists regarding the clinical course of generalized pustular psoriasis. This study aimed to examine the precipitating factors, clinical manifestations, laboratory data, relapse patterns, and prognosis of generalized pustular psoriasis at our hospital and to improve the diagnosis and treatment. A retrospective analysis was conducted for generalized pustular psoriasis in our department from 2014 to 2019. In total, 110 patients were included in our study (mean age 46.5 years). The female:male ratio was 1:2.7. Ninety‐four (85.5%) had a psoriasis vulgaris history, 12 (10.9%) had a psoriatic arthritis history, five (4.5%) had an erythrodermic psoriasis history, and 16 (14.5%) had a family history of psoriasis. Eleven (10.0%) cases were triggered by infections and 17 (15.5%) were caused by the sudden discontinuation of systemic drugs. During hospitalization, the proportion of patients with hyperlipidemia was higher after acitretin treatment than before acitretin treatment (P < 0.05). The proportion of patients with abnormal liver function was higher after methotrexate treatment than before methotrexate treatment (P > 0.05). The onset age of generalized pustular psoriasis was younger in patients without prior psoriasis (P < 0.05). The mean time to pustular clearance was shorter in patients with prior psoriasis than in those without prior psoriasis (P > 0.05). Moreover, among patients with fever, skin lesion clearance rates were highest in the biological agent group (81.8%). However, among patients without fever, skin lesion clearance rates were highest in the acitretin group (86.7%). No patients presented serious complications or died. Our study presents the detailed clinical course of generalized pustular psoriasis in Chinese patients. These results will help to better understand and treat generalized pustular psoriasis.