I have a 1918 Buffalo nickel... well just check the picture out and tell me what the heck this is... thank you.
Damage - it's a 'hit' or contact mark from something that hit the coin well after it was in circulation. Not an error of any kind, I'm sorry to say.
A hit that moved a small amount of metal up. Well circulated coins show lots of anomalies from PMD, post mint damage. Welcome to CT and it is just about always good to post FULL SIZE images that have been cropped to show the obverse and reverse of the coin and then close ups of area in question. Make sure they are properly orientated so us old people don't get a kink in our necks.