This text documents the science that lies behind the expanding field of cosmetic dermatology so that clinicians can practice with confidence and researchers can be fully aware of the clinical implications of their work. New chapters have been added to this edition on skin bioengineering, skin imaging, sunscreens, gel nail polish, management of hair loss, cosmetics and moisturizers in acne management, cryolipolysis, and radiofrequency for minimally invasive body contouring, amongst others, and chapters have been updated throughout to keep this at the forefront of work and practice. The Series in Cosmetic and Laser Therapy is published in association with the Journal of Cosmetic and Laser Therapy.