Odd mark on 98 Penny

I came across this 98 Penny with a odd mark underneath the first Nine it looks like its supposed to be a MM but its at an odd angle as well.

And I know my pics are not the greatest at all, I don't have a ton of experience with photographing coins but I am learning and working on a better solution. But these are the best I can do for the time being.

Any suggestions on what this mark could be would be great.

 

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Unusual.
I hope someone comes along with an answer.

 

Based on your photos it appears to be a plating blister you can see other's as well on the coin.IMO
Dave
Ps. Don't forget to check the reverse to see if it's a WAM.

 

Either a plating blister or a hit which explains the straight line under both nines which pushed a small amount of metal upwards. Either way, it a spender.

 

Your 1998 Cent was minted at the Philadelphia Mint
They don't use a Mint Mark and Cents. Only once which was for last year 2017.
What you are seeing is a simple plating issue. Nothing to do with a strange Mint Mark. Most likely a Plating Bubble.

 

So just a blister, Thank You.