Scars are healed granulation tissue that forms after wounds heal. They lack hair follicles, sweat glands, and elastic tissue. Initially reddish brown, scars become white or glistening over time. Childhood scars enlarge with age. Scars can provide identification through their shape and location, and the age of a scar is important in criminal cases as circumstantial evidence. A scar's age can be determined by its appearance, as within 2-6 months it becomes brown or copper red but remains soft, and after 6 months turns white and glistening as it toughens.