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患者女,25岁,因左足踝关节处红斑3个月就诊。曾外用皮炎平软膏,皮损无改善。皮肤科检查:左足踝关节伸侧可见一15cm×8cm环状红斑,周边颜色暗红,中心较淡,上有鳞屑,边界清楚,足背有2块约5分硬币大的浸润性斑块。环状红斑皮损处皮肤干燥,无汗,毳毛消失,对触、压、冷和热觉较周围皮肤明显减退。周围神经未见异常。患者无眉毛脱落,黏膜无皮损、淋巴结未及肿大。该患者确诊最需要进行哪项检查?
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