一个潜在的不利因素是阿尔法羟基酸“使表皮变薄，更加敏感从而易被阳光灼伤，”但它远不及Retin - A带来的敏感程度，他说。
One potential downside is that alpha-hydroxy acids "thin out the epidermis, making it a little more sensitive to being sunburned," but not nearly as sensitive as it is to Retin-A, he said.
即使你已经连续几年都服用相同剂量，它还有可能突然使你的血液一定程度上变薄，因为你身体状况发生了变化，可能是饮食或基本新陈代谢的改变所致。
And even if you've been taking the same dose for years, the degree to which it thins your blood may suddenly change because of changes in your other meds, your diet or your underlying metabolism.
随着时间的推移，二氢睾酮使你的毛囊变薄、变短、变脆弱和最终导致他们不能重新长出头发。
Over time, DHT causes the follicles to become thinner, shorter and weaker, and eventually stops them from regrowing new hair.
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