Home Skincare Glossary Wrinkles Wrinkles are fine lines or creases that develop on the skin’s surface as a natural part of aging. They can also be caused by sun exposure, smoking, and other environmental factors that damage the skin’s collagen and elastin fibers. 5 Best Anti-Aging Beauty Products to Try in 2025 The Best Neck Creams for Firmer & Smoother Skin Wrinkles Under Eyes When Smiling: Causes, Treatments, and Prevention 11 Best Natural Anti Aging Skin Care Products A Guide to Treatments & Procedures for Under Eye Wrinkles