Scars are marks that form as part of the body's natural healing process after an injury, surgery, or skin condition such as acne or chickenpox. When skin is damaged, the body repairs it by producing collagen, which creates a visible mark that often differs in texture, color, or depth from surrounding skin. The appearance of a scar depends on several factors, including the size and depth of the original wound, how the skin heals, the location on the body, and individual skin characteristics such as age and genetics. Scars typically fade over time, though the rate and extent of improvement varies widely.