黄脸
yellow face (due to sickness etc); yellow-skinned people
黄连
Chinese goldthread (Coptis chinensis), rhizome used in medicine
哑巴吃黄连,有苦说不出
to be forced to suffer in silence (idiom); unable to speak of one's bitter suffering; sometimes written 啞子吃黃連,有苦說不出|哑子吃黄连,有苦说不出