The spots arise when groups of cells begin producing pigment in response to repeated stress or irritation of the skin.

这些黑斑在大量细胞由于反复压力或皮肤受到刺激产生色素时出现。

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The spots arise when groups of cells begin producing pigment in response to repeated stress or irritation of the skin.

这些黑斑在大量细胞由于反复压力或皮肤受到刺激产生色素时出现。

youdao