“…Antibiotics, surgical debridement, vacuum aspiration and skin-grafting treatment were given which may delay treatment, extended treatment time and costs, and even lead to secondary infection. Dozens of cases at home and abroad like this [2], [5], [6], [7]. Pyoderma gangrenosum is frequently associated with underlying systemic disorders, such as ulcerative colitis, Crohn’s disease, leukaemia, rheumatoid arthritis.…”