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你一天洗几次脸？会使用洗面乳吗？皮肤科医生提到人们在清洁时最常犯的一个错误：早晚都用洗面乳。

表皮层的结构分为5层：{1}角质层、{2}透明层、{3}颗粒层、{4}有棘层和{5}基底层。平常洗脸主要是清洁角质层。

角质层是很坚韧的，是皮肤屏障的第一层，能抵御外界侵蚀，防止水分流失，阻止细菌和有害物质入侵；但它又是脆弱的，每天都在脱落、再生，清洁过猛就会受损，导致红血丝、敏感，洗完脸干燥、紧绷、脱皮，擦了保湿护肤品也觉得干燥。

若不是特别油的皮肤，一天用1次洗面乳就足够了，早上可以用清水洁面；容易出油的皮肤，早上应用温和的洗面乳。面部清洁产品可视具体情况、个人皮肤特点和爱好取舍，但总的来说还是应该洗后皮肤不干燥为主。

一般的防晒、隔离、淡妆，洗面乳就能洗掉，尽量不用各种卸妆油、卸妆液。

只有使用油彩浓妆或防水的化妆品才需要使用卸妆油。洁面应该使用保湿类产品，以恢复皮脂膜。

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