Sentence:  If you want to continue wearing low-cut necklines and avoid having to rely on turtlenecks and scarves to hide your neck, you have to take care of the delicate skin below your jawline, namely your neck and <WSD>décolletage</WSD>. 
Meaning of the word marked with <WSD> tags:  The portion of a woman's body that is revealed by a low neckline; the upper chest, as well, sometimes, as the neck, and shoulders.