说到痘痘，大伙都很熟悉。脸上那一个个红的，白的，黑的点点包包可真叫人难受，实在是影响形象啊！那样，痘痘又是如何形成的呢？就让下文为你讲解一下吧。
Zits are what happen when the oil glands1 in your skin get clogged3 and pus is what comes out when you pop them.
But don't pop them! It only spreads infection and can make your embarrassing zits even worse!
Zits do not care about color, sex, or age, everyone from teenagers to grannies get zits. In fact, zits can be found on the faces and bodies of over 70 million people!
A lot of things can cause zits. Including stress, and a build-up of toxins4 including infection. Stress is not just a mental state of being, it can also affect your physical wellness. If you have an infection, it will find an outlet5 through pimples6.
During your teen years your body starts to do some funky7 things while it grows up, including producing more testosterone （a male hormone8 found in females as well as males, but in varying amounts）, which tells your body to start producing more oil. As a result, the dead skin cells mix with the oil and clog2 your pores, causing zits.
There are a few kinds of zits, all undesirable9, but some more than others. When your skin is clogged up with enough skin cells and oil, you get whiteheads; a small white bump under the surface of the skin. When it reaches the surface, it appears black and a blackhead develops. It isn't a dark color because of dirt, but rather from melanin pigments10 （the stuff that gives color to your skin and hair）.
If the wall of the pore breaks, it can become inflamed11 and red. If it breaks further below the skin's surface acne nodules or cysts can form. It is important to get these treated, unless of course you want permanent scars.
Did you know?
Chocolate doesn't cause acne. Experiments conducted at the University of Pennsylvania and the U.S. Naval12 Academy found that consumption of chocolate - even frequent daily dietary intake13 - had no effect on the incidence of acne. Professional dermatologists14 no longer link acne with diet.
Think that only dirty people get zits? Nope. Clean people get zits too. Bacteria （the good and bad kinds） lurk15 in everyone's skin.
Will scrubbing my face a lot get rid of my zits? Sorry Snoopy, although washing your face is necessary, stripping your face of the natural oils cause your glands to go into hyper-drive to make up for it, which will lead to even more breakouts! You should only wash your face gently with a mild cleanser no more than twice a day.
clog: 堵塞
pus: 脓
toxin: 毒素
melanin: 黑色素
