化学剥脱法，是一种常见的外用药物治疗痤疮的办法。

An external method of treatment, chemical exfoliation for acne, is usually added to medications.

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结果：外用药物的使用不能使大鼠肝脏中微量元素的含量增加。

Result:We found that medicines for external use couldn't increase the contents of the trace elements in liver of Wistar rats.

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到目前为止，没有任何研究显示任何风险增加对人类使用外用药物。

So far, there are no studies showing any increased risk to humans using the drug topically.

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