碘伏棉签变黑是什么情况？

来自金志明医生的专业解答，快打开看看是否又获得了新的知识点～

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快速问医生

病情分析：你好，碘伏消毒后出现皮肤变黑也没有关系。变颜色是因为碘和其它污物发生反应。孩子脸上可能不干净，遇碘之后变色。一般情况下是碘与淀粉变色。你可以多消几次，用干棉签把变色的皮肤重新擦两遍，然后再涂碘伏消毒就可以。

金志明

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提示：本内容仅作参考，不能代替面诊，如有不适请尽快线下就医

问题描述：宝宝脸上有一个小伤口，我用棉签蘸碘伏擦，然后棉签上擦拭皮肤过得地方碘伏变成黑的！是什么情况？没擦过的碘伏还是碘伏的颜色！我以为碘伏过期了，就弄了一点擦我的皮肤，就没有颜色的改变，还是碘伏颜色什么原因？