The Amount of Sunscreen You Should Use for Maximum Protection

用多少防晒霜才能获得最大防护

Many of us have probably experienced squeezing out what we think might be way too much sunscreen, and so we desperately try to smear the extra on the closest person, or shove some back into the bottle (with no luck). As it turns out, we may actually need all of that...and more.

许多人可能都有过这样的经历：认为挤出的防晒霜有点太多了，于是拼命试图将多余的涂到最近的人身上，或者吸一些回瓶子里(比较不幸)。事实证明，实际上所有挤出来的这些我们可能都需要……甚至更多。

According to this article by the Skin Cancer Foundation, the general recommendation is 2 milligrams of sunscreen per square centimeter of skin. In plainer terms， that’s about one ounce of sunscreen, or enough to fill one shot glass (or two tablespoons). What’s more, you should save one “nickel-sized dollop” for the face alone.

根据皮肤癌基金会的一篇文章，通常建议每平方厘米肌肤涂抹2毫克的防晒霜。更直白地说——就是约一盎司的防晒霜，或足以填满一个矮玻璃杯(或两汤匙)的量。更重要的是，你应该为自己的脸单独留下“一个硬币大小的”一块防晒霜。

If you use a non-cream type sunscreen, such as a spray, apply enough until an even sheen appears on the skin. The trouble with sprays is, you can’t really know whether you’ve used enough of it. The American Academy of Dermatology suggests using liberal amounts, but avoiding spraying directly into your face. If you must use the spray on your face, spray your hands first and then apply that to your face.

如果你使用一种非油脂型防晒霜，如喷雾型的，要涂抹至皮肤上显现出光泽才够。喷雾型的问题在于，你无法知道是否已经使用了足够的量。美国皮肤病学会建议用量自由，但要避免直接喷到脸上。如果你必须在脸上喷洒，先喷到手上，然后在涂抹至脸部。