To be clear with Surgery Nomenclature, it does not matter how the injury was inflicted.
The term you are seeking is: "Depressed Cutaneous Scar". More information here(Pay-wall), and here.
(Colloquially known as 'icepick scars')
Depressed cutaneous scar treatment
A common surgical treatment option is known as a Subcision.
"...involves sliding ...
It seems to be still under debate. Contradictory evidence has been found.
The relative importance of Endothelin Type A and Endothelin Type B receptors during myocardial ischaemia are still debated.
The word you are seeking is regenerative. Mammalian hearts are made from non-regenerative tissue.
"While several animals can regenerate heart damage (e.g. ...