Epidermal nevus

Japanese: epidermal nevus(英語表記)epidermalnevus
Epidermal nevus

...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 thickening of epidermal cells, and is often arranged in a linear pattern. The surface feels rough and hard to the touch, and the color ranges from brown to blackish brown. There are usually no subjective symptoms, but some people complain of severe itching.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。ふつう自覚症状はないが,つよいかゆみを訴えるものもある。…

※「epidermal nevus」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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