肤色问题主要根源在于黑色素过多，皮肤缺水和更新减慢。
Skin tone concern is mainly caused by excess melanin, dehydration and slow renewal.
这听起来很矛盾，因为这一假设背后的理念是，树叶在秋天产生的红色素是用于保护叶绿素这种吸收光的化学物质，以免它吸收过多的光。
It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.
而对于长时间频繁遭受太阳暴晒的皮肤，黑色素便会“集群分布”或产生过多，此时就显示出老人斑。
On areas of the skin that have years of frequent and prolonged sun exposure, age spots appear when melanin becomes "clumped" or is produced in particularly high concentrations.
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