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Dullness is a sign you need to exfoliate. "Skin holds on to dead cells rather than shedding them, especially during dry times like winter," says Robin Evans, a spa owner in New York City. Twice a week, apply an exfoliating mask.
Our Pick: Clinique Turnaround Instant Facial, $36.50, clinique.com. A low dose of salicylic acid dissolves dry cells; round beads whisk them away.