brown or gray spots
褐色或灰色斑点
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mongolian spots (technically named congenital dermal melanocytosis) are flat bluish-green, gray or light brown areas where cells called melanocytes have been trapped in a layer of the skin called the dermis.
CNN: What are Mongolian spots?
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