Name: 什麼原因導致嘴脣皸裂？| 脣膏 (What causes chapped lips? | #aumsum)
Uploaded: 2021-01-14T08:10:47.000Z
Duration: 1 min 33 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

This is because the outermost layer of our skin called stratum corneum is much thinner on our lips than on any other body parts.

As it is thinner, the blood vessels inside them are more prominent making our lips appear reddish or pinkish.

Besides this, the skin on our lips doesn't have oil and sweat glands which secrete substances to moisturize the lips.

Now, usually during cold months, as the air has less moisture, the moisture from our lips evaporates causing them to get dry and chapped.

So to provide moisture, we can lick our lips and apply saliva.

Saliva draws more moisture and heat from our lips and evaporates, thus leaving our lips more drier than before and thus, making the condition worse.

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什麼原因導致嘴脣皸裂？| 脣膏 (What causes chapped lips? | #aumsum)

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