Seborrheic keratosis

Japanese: seborrheic keratosis(英語表記)seborrheickeratosis
Seborrheic keratosis

...They are hemispherical tumors about the size of a bean or less that protrude from the skin surface, have a smooth, shiny surface, and are characterized by a depression in the center.
[Senile warts]
Senile warts, also known as seborrheic keratosis, are found on the face and trunk after middle age and are not contagious but are thought to be caused by skin aging. Many of them are black-brown in color and are the raised appearance of age spots.

*Some of the terminology that mentions "seborrheic keratosis" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アズキ大以下の,皮膚面から半球状に盛り上がる表面がなめらかで光沢のある腫瘍で,中央部に陥凹がみられるのが特徴である。
[老人性のいぼ]
 老人性のいぼは,脂漏性角化腫seborrheic keratosisと呼ばれるもので,中年期以後の顔面,軀幹にみられ,伝染性のものではなく,皮膚の老化現象によるものとされている。黒褐色調を呈するものが多く,いわゆる老人性のしみの盛り上がったものである。…

※「seborrheic keratosis」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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