Unfortunately, your coin has been damaged by zinc rot(corrosion). Post-1982 cents are copper-plated zinc and were plagued by split plating(especially around the mintmark). When the plating is split, the zinc core begins to corrode and the copper plating can flake off. Your coin lost the copper plating of the mintmark from this corrosion process and you can also see other affected spots on the neck and the profile of the nose.























