If your skin is cut deeply, meaning a cut to dermis why is that we can see scar tissue. I mean if the cut region in the dermis would be replace by scar tissue, but the epidermis region above that would have normal epithelial cell because they can divide easily. So if the epidermis grows back normally how can we see scar tissue? Thanks

I would guess it has to do with cell growth coming from the two zones of the cut at the same. When we grow, there is only one zone. A wound changes this into two independent growth zones.

 

A good analogy of normal growth is blowing up a balloon. The entire surface stretches simultaneously (cells dividing holographically). Say we had two cylindrical balloons, to simulate the cut, where the two balloons meet, there is a pressure zone which is good for sealing the wound, but this situation loses the holographic symmetry making a less than perfect blend.

 

I would guess, since the skin has so many nerve endings, the brain has an good picture of what the skin used to look like. This ideal skin is the goal with at least some of the scare tissue eventually trying to move back to the ideal memory. The compromise is the updated memory.