Scar tissue is also a build up of extra collagen particles in and around cells as part of repair. These turn over much more slowly, sort of stuck this way until better blood flow or proper skin cells return to the area, if at all. This is why some scars fade by many last forever. If you get a decent scar when younger, the skin cells propagate but your body is growing as well, making it hard for the proper growth to overtake the damaged area. Sometimes scars grow for this reason
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