黒くろずみ

noun

blackhead

Specifically refers to a blackhead (comedone) on the skin, often in skincare contexts.

• 鼻はなの黒くろずみが気きになる。

  I'm bothered by the blackheads on my nose.

noun

dark discoloration; blackening; tarnish

General term for dark staining or discoloration on surfaces, metal tarnish, or soot-like marks.

• 銀ぎんのアクセサリーに黒くろずみが出でてきた。

  Dark tarnish has appeared on the silver accessory.

• 壁かべの黒くろずみはカビかもしれない。

  The dark discoloration on the wall might be mold.