Glands underneath our skin manufacture sebum, an oily substance that coats hair follicles.

我们的皮肤下的腺体会产生皮脂，这是一种覆盖毛囊的油性物质。

One of the main things that comes seeping out of your pores is a special oil called sebum.

从毛孔渗出的主要物质之一是一种叫做皮脂的特殊油质。

Androgen hormones are linked to sebum production.

雄性激素会影响皮脂的分泌。

This is because sebum is composed of both saturated and unsaturated fatty acids.

因为皮脂是由饱和脂肪酸和非饱和脂肪酸共同组成的。

In the process, sebum makes hair clump together and appear greasy.

在这个过程中，皮脂使头发聚集在一起，看起来油腻。

Malassezia eat sebum by secreting an enzyme that releases all of the oil's fatty acids.

马拉色菌分泌一种酶，分解皮脂中的所有脂肪酸。

Testosterone sends the production of sebum into overdrive, increasing the incidents of blockages.

睪酮会让皮脂的分泌失控，提高阻塞发生的机率。

When the white blood cells die, they, combined with the dead skin and sebum, create the pus-filled pimple.

当白血球细胞死去时，它们再加上死皮和皮脂，就会造成化脓的痘痘。

So during puberty, when the hormones are highly active, there's an increase in sebum production.

所以在激素高度活跃的青春期，皮脂分泌也会增加。

When you're stressed, you produce more hormones, which then increases your sebum production.

当压力增大，激素水平会上升，从而导致皮脂分泌增加。

Babies' glands create sebum at a much slower pace than adults', so their hair is usually less oily and greasy.

因为和成人相比，婴儿的腺体产生皮脂的速度要慢得多，所以通常他们的头发不会那么油腻。

But it also collects dirt, and, if left untouched for too long, sebum can cause our hair to become greasy.

但它也会积聚污垢，如果长时间未接触，皮脂会使我们的头发变得油腻。

Since sebum is an oil, a lot of people say that greasy foods will cause acne.

鉴于皮脂是一种油脂，很多人因此认为油腻的食物会导致粉刺。

They make an an oily substance called sebum that’s useful in lubricating the canal.

他们制造一种称为皮脂的油性物质， 可用于润滑根管。

Fewer androgen receptors at work means less sebum production, which means less acne.

（因雄激素减少导致）起作用的雄激素受体减少，皮脂分泌就会减少，痤疮自然也减少。

In women, some success has been seen with oral contraceptives, which decrease the ovaries' production of androgen hormones, ultimately decreasing sebum.

女性的话，有些吃口服避孕药成功治痘的案例，口服避孕药能减少卵巢制造的雄性激素，最终减少皮脂生成。

And this is where bacteria come into play, feeding on the dead skin and sebum, which can unfortunately lead to infection.

细菌就是在这时开始起作用，以死皮和皮脂为养份孳生，那可能会很不幸地引发感染。

But things can go very wrong if your sebum production gets out of whack.

但是如果皮脂分泌出现问题，事情就严重了。

For those who experience dandruff, it usually comes and goes as sebum secretions vary throughout one's lifetime due to hormonal changes.

对于那些有头皮屑的人来说，皮脂分泌物通常随着人一生的激素水平的变化而变化。

You end up with a blockage that then traps more dead skin cells, plus sebum.

最后形成堵塞，使更多的死皮细胞和皮脂陷在毛孔里。