顔色が

look pale or unwell

→ 顔色
phrase Uncommon #11,517
look pale or unwell Usually followed by よい/いい (good) or 悪い (bad). 顔色が悪い means that someone looks pale, sick, or unwell.
JA: 顔色が悪いけど、大丈夫?
EN: You look pale—is everything okay?

顔色がよくありません

You don't look well.

彼は今日はうんと顔色がよい

He looks a lot better today.

顔色がよくないわね

You don't look well.

— 紅夢 (1991)

私は彼女に顔色が悪いようだけど大丈夫ですかたずねた

I asked her if she was okay because she looked pale.

顔色が真っ青だぞ

You look deathly pale.

— イル・ポスティーノ (1994)

そういえば顔色がいや

Come to think of it, you don’t look well.

— 生きる (1952)

顔色が青い

You look awfully pale.

— AKIRA (1988)

顔色がよくない

You don't look well.

今日は顔色が悪く見えます

You look pale today.

— तुम्बाड (2018)

肉食しかも顔色がいい

He eats meat, and on top of that, he has a healthy complexion.

— バジュランギおじさんと、小さな迷子 (2015)

顔色が良くない

You don't look well.

— 箪笥<たんす> (2003)