Some scars never fully disappear because scar tissue, once formed, isn't replaced by normal tissue even though the body may continue to refine the scar's appearance over time.
While the body does work to "touch up" scars after they initially form, leading to a slight fading over time, the fundamental issue is that the original tissue is not regenerated.
Here's a breakdown:
- Scar Tissue Formation: When skin is injured, the body quickly repairs the damage. This repair often involves the production of collagen fibers, which form scar tissue.
- Limited Replacement: According to the provided reference, while scars may fade over time, the scar tissue itself does not get replaced by normal skin tissue. This is the primary reason scars persist.
- Natural Fading: The body continues to work on the scar, which is why most scars left to heal naturally fade slightly over time. However, complete disappearance is rare.
Therefore, scars remain visible because the body prioritizes quick repair (scar tissue formation) over perfect regeneration (replacement with original tissue).
