Environmental damage?

I’m up way into the night going through Mr. Lincoln’s and happened upon this one. I’ve seen thousands of scratched and gouged coins, scratched and mutilated and almost always the metal separates from this damage I noticed this running along the obverse and then flipped it over and noticed another small line going through the T and E in United States. I’m going to let the experts take a look...any ideas what this is? It’s a 1999 cent..thanks.

 

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It's a linear plating blister. Minor issue on copper plated zinc cents.

 

Is that the same minor error running through the speared bison by some chance?

 

@SensibleSal66
This website explains it better.
http://www.error-ref.com/blisteredplating/

No..
Speared bison is a gouge on the Die.. Nickels are not plated so they can't have blisters. But that was a good question.