1957 d wheat penny

Why is there a bubble by his chin

 

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First, welcome to the neighborhood @Jeremy Seekings !

Can you provide us a better close-up of just the area surrounding the anomaly?

TIA!
Chris

 

i am not able to get a better pic was told it maybe a rockwell test spot

 

took a toothpick it is hard

 

I think it's too big to be a Rockwell Test

Could be added material?

 

Im not sure i am new at this just cant find a answer to what it may be was told to send it in but i just think waste of money

 

Looking up RTS. I think it's just damage.
Planchets with Rockwell Test Marks are very rare to extremely rare. “Dies and planchets tested in this fashion are supposed to be discarded, since they are blemished once the procedure is completed. If they are not discarded, then you have a desirable die error and planchet error, respectively.”
Linky: https://conecaonline.org/rockwell-hardness-test-marks-on-lincoln-cents/