nevus spilus (English spelling) nevusspilus

Japanese: nevus spilus(英語表記)nevusspilus
nevus spilus (English spelling) nevusspilus

...Moles are generally not seen in infants, and they gradually increase in number from around the age of 10, but those that are larger than a certain size or have dense hairs, called tierfell nevus, are present from birth. Flat brown spots, called nevus spilus, are often noticed within a few months of birth, but some appear on the shoulders, chest, etc. after the age of 10.
[epidermal nevus]
It is caused by a thickening of epidermal cells, often arranged in a linear pattern, with a rough and hard surface that can range in color from brown to blackish brown.

*Some of the terminology that mentions "nevus spilus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一般に乳児にはほくろは認められず,10歳前後から徐々に増えてくるものであるが,ある程度以上の大きなものや,毛の密生する獣皮様母斑tierfell nevusと呼ばれるものは生下時から存在する。扁平な褐色斑は扁平母斑nevus spilusと呼ばれ,生後数ヵ月以内に気づくことが多いが,肩,胸などに10歳を過ぎて現れてくるものもある。
[表皮母斑epidermal nevus]
 表皮細胞の肥厚によるもので,線状の配列をとるものが多く,表面はざらざらして硬く触れ,色は褐色調を示すものから黒褐色のものなどがある。…

※「nevus spilus」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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