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【单选题】
患者男性,43岁。肛肿痛4天,肛门左侧皮肤发红并伴疼痛,以坐排便。2天前加剧并局部肿胀,无畏寒、发热。体检:胸膝位肛门11点处见局部肿胀,约2cm×2cm,有脓头,围皮肤发红,波动感(+)。引起该病的最常见原因是A.
外伤
B.
肛皮肤感染
C.
肛腺感染
D.
痔行药物注射治疗后
E.
血栓性外痔剥离术后
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