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A birthmark is a mark on the skin that is already there when a baby is born — a patch of colour, a spot, sometimes a little raised. It stays. It is not a from a bump, and it is not a mole that appears years later, though in casual talk people do mix later marks with this word. English once had other names (people said a mother's mark); birthmark is the normal word now. Doctors have extra names for different kinds, but everyday English is happy with this one word.
胎記（不是後來長出來的痣）
組成birth + mark. It displaced older names such as mother's mark.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
birthmarknoun/ˈbɝθˌmɑɹk/
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A mark on the skin formed before birth.
- facial birthmark
- large birthmark
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。