All of the answers can be found in the brain. For instance; you mentioned a scar that remains instead of back to fresh flesh; the reason that your new cell takes on the scar, is because your brain has the imprint that there is a scar.

If you were able to replace that image with fresh flesh, when that flesh is replaced, there would be no scar.

Using your computer model; you can’t just go to a “previous save” – you can’t use a “bug fix”, you have to rewrite the program – without the flaw.

May your path always be bright,
Dr Joe – http://joeparazoo.com