Skin Rules (St. Martin's Press), a new book by dermatologist Debra Jaliman, MD, goes on sale March 13. According to a release, the book "lays out clear, easy-to-understand information on the latest technologies, such as Cool Sculpting (body contouring through fat freezing) and Thermage radio frequency (skin tightening without surgery), as well as advice on what products are worth spending money on (moisturizers, sunscreens and anti-aging products), and which ones you don't need to pay a lot for (cleansers)."