乳液

1. Origins, structure, and basic meaning

• Structure: 乳液(にゅうえき) denotes a milky liquid and is also used for a cosmetic emulsion.
• Basic usage: It describes applying a thin layer of the cosmetic product after washing the face.
  • 洗顔後、顔に乳液を薄く塗った。

2. Common pitfalls and similar expressions

• Matching product names
  • English lotion may refer to 化粧水(けしょうすい) or 乳液, depending on the product. The two Japanese terms therefore should not automatically be treated as the same product category.