Why do we sometimes get long-term scars for minor wounds or even scratches? Like I still have a scar on my knee from a minor scratch on a fence 8+ years ago? Or a very visible scar was left behind from a shallow dog scratch from a year ago? I just always think of scars as something that comes from more major wounds or is that a made up thing?
In: Biology
You have different layers of skin. If the cut is shallow enough, the upper layers kind of inject cells similar to stem cells, to make new skin. If the cut goes deeper than the lowest layer of skin, the the body injects a different material, a little more like caulk, and it hardens as a scar.
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