口こう辺へん

noun, noun which may take the genitive case particle 'no'

around the lips; perioral area

Refers to the area surrounding the mouth. Often used in medical, cosmetic, or descriptive contexts. Can function as a noun or as a no-adjective modifying another noun.

• 口こう辺へんにできた湿しっ疹しんが気きになる。

  I'm concerned about the eczema that appeared around my mouth.

• 口こう辺へんの筋きん肉にくを鍛きたえるトレーニングがある。

  There are exercises to train the muscles around the mouth.