The décolletage (dec) refers to the chest area, below your clavicle bones and just above the breast. The skin on your neck and dec are quite different to that of the face, making them more prone to signs of ageing. This is because the skin on both of these areas is thinner, has less fat and there are very fewer sebaceous glands here. The reduced amount of oil can create more dryness and the thinner skin is more likely to show the signs of ageing such as reduced skin laxity and crepey texture.