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Please assume a case were a human had a plastic surgery to revise a scar and the surgeon mistakenly removed a bit too much of external tissue (skin/sub-cutaneous-fat) so the scar has become much smaller but a "sink" or a "submergence" became somewhat evident.
What is the term for external tissue insufficiency after surgery?
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 a needle under the skin to release scar tissue, accompanied by saline injections to stimulate production of new collagen."
Other forms of treatment include:
