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Post‐ulceration period and its related factors. A, Only burn scar was found to cause post‐ulceration periods of more than 24 months, and it happened in 7 out of 19 cases. B, Incomplete healing caused a significantly longer post‐ulceration period than other ulceration causes. C, Longer post‐ulceration period (>6 months) is positively correlated with complete tumour resection. *P < 0.05; **P < 0.01; ****P < 0.0001; NS, P > 0.05
