Cosmetics are substances used to enhance the appearance or odor of the human body. The manufacture of cosmetics is currently dominated by a small number of multinational corporations that originated in the early 20th century, but the distribution and sale of cosmetics is spread among a wide range of different businesses. This book presents current research data in the study of cosmetic types, allergies to and applications. Some topics discussed herein are suncare products; the hazards of traditional cosmetics used in the Islamic world; occupational contact dermatitis to cosmetics; heavy metals exposure from some cosmetic consumer products; and solid lipid nanoparticles used in cosmetic applications.