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It may depend on the age and caloric intake of the person. A surgical incision will heal with less of a scar if the person doesn't diet while healing.

That is true, combined with a few other factors. This article explains everything pretty well:

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Q: Why do some wounds leave permanent scars while others heal completely?
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On what basis did soldiers go on leave in World War 1?

if they had severe wounds if they had severe wounds

Can wounds be cured?

Without the complication of infection, most wounds heal well with time. Depending on the depth and size of the wound, it may or may not leave a visible scar.

If you dye your blond hair a semi-permanent dark brown will it wash out completely or will it leave a darkish shade over your natural hair color?

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Why do large wounds normally leave a scar?

Large wounds can leave a scar because the healing process involves the production of collagen fibers, which can be thicker and more pronounced in larger wounds. This excess collagen may lead to the formation of a scar as the skin repairs itself. Additionally, the skin may not be able to regenerate perfectly, resulting in a visible mark on the skin.

Why did Franklin D Roosevelt leave politics?

Polio and permanent paralysis

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Does tuberculosis leave permanent damage?

It depend on the severity of the disease. In most cases it can be healed completely. But in severe ones, the damage is permanent and nothing can be done to remove it. For instance, the pulmonary tuberculosis can be healed, but if it has developed fibrosis of the pulmonary organ, it cannot be undone. For more information you can read <a href="">Tuberculosis symptoms</a>.

Can ink pen leave a freckle?

An ink pen, even the permanent type, can't leave permanent marks on the skin with normal use; no matter how dark you make the mark it'll wash off eventually.

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Why did the permanent Indian frontier fail?

because the Indians didn't want to leave