Energy on the skin has revolutionized medicine: in the last 25 years laser and IPL devices have made completely new medical treatment concepts possible, with considerable therapeutic success. The rapid technical advances in energy-based instruments require continuous training for attending physicians. This book presents all the available energy-based systems for the treatment of cutaneous diseases, including a wide range of laser applications, IPL and energy-based devices such as the lightning lamp-pumped pulsed dye laser, solid state lasers like neodymium-doped yttrium aluminum garnet (Nd YAG) laser, quality switched ruby laser, erbium-doped yttrium aluminum garnet laser (YAG) and CO2 laser, as well as radio frequency and high-intensity focused ultra sound, photodynamic therapy and more. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.