。。
Are you sick? You look pale.
Literal
Sick [question-ですか]. Face [subject-が] pale [emphasis-よ].
A two-part exchange: a polite question followed by a casual observation. 顔が青白い means 'face is pale' — 青白い combines 青 (blue/green) and 白い (white). The よ at the end draws attention to the observation.