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Background:Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis that is highly associated with inflammatory bowel disease (IBD).Certain PG patients with no systemic disorders have been diagnosed with idiopathic PG.This study sought to clarify the difference between PG with IBD and idiopathic PG based on clinical features,laboratory tests,and medications.Methods:Twelve patients with PG and IBD and 24 patients with idiopathic PG,who were hospitalized in Peking Union Medical College Hospital from 2000 to 2017,were retrospectively categorized into the IBD group and control group,respectively.Data of clinical features,laboratory tests,and medications were collected and compared between the two groups.Results:Both groups were similar with respect to their clinical features.However,the IBD group had an increased occurrence ofarthralgia or arthritis (58.3％ vs.12.5％,P =0.007),anemia (83.3％ and 29.2％,P =0.004),and an increased percentage of antineutrophilic cytoplasmic antibody (ANCA)-positive patients (85.7％ and 0.0％,P ＜ 0.001),compared to the control group.Conclusion:PG patients with IBD had increased occurrence rates ofarthralgia or arthritis,anemia,and ANCA-positive status compared to idiopathic PG patients.