There are two main layers of the skin that is the epidermis(superficial) and the dermis(deep). The epidermis is responsible for constant tissue renewal. Therefore, when skin damage is limited to this layer the wound heal without a trace.
But when the dermis is affected, a scar is almost guaranteed, that’s it responsible for healing wounds and also preventing scars as well.
A scar is visually different from normal skin, because the basal layer of the epidermis responsible for its repair is damaged and the skin cannot be the same.
However the body decides to fill the gap with connective tissue which does not have a structure like the normal skin but it leave a scar on the skin on the skin.
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