Concur, it's either a small die chip (which is a "true error" but holds little to no extra value) or plating bubble, which is annoyingly present on a lot of copper coated zinc cents and holds no value beyond 1 cent.
Possibly dirt/contamination in the plating bath that adhered to the coin during the plating process or dirt/dust/junk still stuck to the planchet when it was plated. Over time this stuff could be an initiation source for corrosion and that's why you see a raised area after striking This is a 1983 coin and the mint supplier was still trying to figure out the high volume plating process. I agree with @Fred Weinberg that it's not a typical plating blister and isn't considered an error