Lactic acid is an alpha hydroxy acid, which encourages the skin to shed its old, dead skin cells to reveal the new, healthy skin cells hidden underneath.

乳酸是一种果酸，能促使皮肤中衰老死亡的细胞脱落，露出里面的健康的新细胞。

In higher concentrations, it also works to reduce pigmentation and brighten the skin.

浓度高的乳酸还能减少色素沉着，提亮肤色。

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HOW TO DRAW YOUR BATH

沐浴选用热牛奶还是冷牛奶

Dr Altcheck says that it's better to use warm milk because it will penetrate the skin faster than cold milk - but warns against staying in the bath for too long.

艾尔切克医生说，最好用热牛奶，因为相比冷牛奶能够更快穿透皮肤，但他警告说，不要在牛奶浴池里待太久。

'It's a double-edged sword because on one hand you want to stay in there long enough to absorb the nutrients,' he said. 'On the other hand, you will become dehydrated if you stay in too long and the water will literally roll out your skin. I would say anything beyond 15 minutes would be harmful.'

他说：“洗牛奶浴是一把双刃剑：一方面你想待得够久，让皮肤吸收养分，但另一方面，如果你待得太久，水分会从皮肤流失，导致脱水。我的建议是泡牛奶浴不要超过15分钟。”

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