Why Scars Change Over Time: The Science of Collagen Remodelling

Most people are surprised by how much their scars change in the months after surgery. A scar that looks firm and red at six weeks can appear softer and paler by twelve months. Why does this happen?

The answer lies in the body’s remarkable ability to remodel itself.

 

The Early Stage – Fast Repairs

When skin is cut or stitched, the body moves quickly to close the wound. Collagen, a strong protein that acts like scaffolding, is laid down in large amounts. But in the rush to protect you, this collagen is built quickly and somewhat haphazardly. That’s why scars in the first few weeks can appear raised, thick, or red.

 

The Remodelling Stage – Quiet Changes

Once the wound is closed, the body begins refining its work. Research published in Nature explains that the early “temporary” collagen (known as type III) is gradually replaced by stronger type I collagen. Over time, these fibres are realigned to follow the body’s natural tension lines, almost like threads being rewoven into a stronger, neater fabric.

This stage is called collagen remodelling, and it doesn’t happen overnight. Surgical literature confirms that it can take 9 to 12 months or more. That’s why your scar at one year often looks and feels very different from your scar at one month.

 

Why Every Scar is Different

Not all scars behave the same way. Factors such as:

  • Wound location – scars on the chest or shoulders may stay firmer longer.

  • Age and skin type – younger skin often produces more collagen, sometimes leading to thicker scars.

  • After-care – sun protection, silicone dressings, and avoiding tension on the scar can all make a difference.

This is why no two patients will have identical results, even with the same procedure.

 

The Takeaway

Scars are dynamic, not static. They continue to evolve as collagen is replaced, reorganised, and strengthened. While a scar never disappears completely, most improve in both appearance and resilience over the first year.

Understanding this process can take away some of the worry if your scar looks different at three months than it does at twelve. Your body is simply doing what it does best — healing and refining, slowly but surely.


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