防晒霜使用不当会伤害皮肤！
炎热的夏季来临，MM们出门要涂防晒霜成了每天的首要事情，但是你真正了解如何正确使用防晒霜么？要知道防晒霜使用不当会伤害皮肤的！
一：按以前肤质选用护肤品夏季由于油脂分泌的不同，肤质会有所改变，应再做一次肤质检测。油性的肌肤宜选择清洁力较强的泡沫型洁面用品和渗透力较强的水性防晒用品；干性肌肤宜选择乳性的洁面用品和霜状的防晒用品；中性皮肤一般并无严格规定。而乳液状的防晒霜则适合各种肤质使用。
二：SPF值越高的防晒效果越好SPF值，亦即防晒系数，是这样计算出来的：一般黄种人皮肤平均能抵挡阳光15分钟而不被灼伤，那么使用SPF15的防紫外光用品，便有约225分钟（15分钟×SPF15）的防晒时间，所以SPF的意思是皮肤能抵挡紫外光的时间倍数。日常护理、外出购物、逛街时可选用SPF5－8的防晒用品，外出游玩时可选用SPF10－15防晒用品，游泳或做日光浴时用SPF20－30的防水性防晒用品。
三：室内、阴天也要使用防晒霜。即使是在室内，在树荫底下，紫外线仍可从沙滩、水池、窗户或四周物体进行折射。就算是阴天，紫外光仍会侵害肌肤。
四：SPF值可以累加SPF值是不能累加的，涂两层SPF10的防晒霜，都只有SPF10的保护。
五：临出门才涂防晒霜防晒霜跟一般的护肤品一样，需要一定的时间才能被肌肤吸收。所以出门前10－20分钟就应涂好防晒霜，而去海滩前30分钟就应涂好。
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六：防晒霜不能在上彩妆之前使用现在新出的隔离霜，其目的就是要在彩妆、阳光、灰尘和皮肤之间形成一层保护膜。
七：使用防晒品一定要达到标准才有效果。通常防晒品在皮肤上涂抹量为每平方厘米2毫克时才能达到应有的防晒效果，一般双臂一次应涂抹2－2．5克。
