That thing that you notice near the mint mark is nothing more than a plating blister, probably caused by zinc rot. It's common and adds nothing to the value of a penny.
Here is a webpage - I want to share with you - http://www.error-ref.com/zinc-deterioration-on-lincoln-cents/
You are welcome If you click on the left side of that webpage it will show you tons of stuff. True errors and post strike damage items.. Enjoy