男性，41岁。以“反复口腔溃疡、外阴溃疡2年，加重伴结节红斑2周”来诊。人院査体：舌尖及下唇内侧黏膜各有一处黄豆粒大小溃疡，阴囊皮肤表面亦可见相似溃疡一处，双下肢小腿伸侧可见数个红斑结节。上肢静脉穿刺部位见红丘疫。该患者诊断是

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