What are the chemicals found in skin and what are their functions?

The skin contains various chemicals, including lipids, proteins, and water. Lipids, such as ceramides and fatty acids, help maintain skin barrier function and hydration. Proteins like collagen and elastin provide structural support and elasticity, while enzymes and antimicrobial peptides play roles in immune defense and skin repair. Additionally, melanin is present, which protects against UV radiation and contributes to skin color.