1983 Lincoln Cent Minor Die Error Or PMD?

As I said in another post, I am very new to coin collecting and just learned about the idea of error coins. After reading a little about dies and the minting process, I have been picking coins out of change that look a little different.

I found a 1983 Lincoln Penny with a minor marking around the date. At first glance it just looks like a small nick or dent near the 8. And I tend to believe it is just minor damage from after its minting. But with closer magnification (which I could not quite replicate with photos), it appears as though part of the 8 broke off and melted... spreading inside the 8 and the 3. I'm not saying that's what I think happened, I'm just describing what it looks like to a novice observer.

Does anyone know if there any known errors of this type, particularly with this year? Opinions about the cause of the abnormality? Thanks.