Think of your skin like the pillow case to your body. When we perform aesthetic surgery to improve the structure of either face, breast, or body, we are altering the pillow underneath. You would never buy a fancy pillow and cover it with an old pillow case. For the same reason, it is important to make sure the skin is revitalized in addition to the underlying structures. 

This is definitely true for facial surgery, where aging skin can undermine an otherwise beautiful surgical result. 

For body, these products can also help with swelling and bruising.