That's a rotten Zincoln for sure! Deposit it in the nearest wishing well, make a good wish, and let's hope it comes true!
The Copper plating was exposed on the rim affecting the inner zinc core in that spot. Nothing else. No mint error of any kind.. Welcome to CoinTalk
I've detected worst looking copper plated zinc cents. They are horrible when left to the elements for a long time
Welcome to CT @Pennywise4040. Those that have been on CT for a while, know how much I detest those lousy Zincoln cents. You are showing perfect reasons why. Good luck, and when you post photos, please click on the "Full Image" button after you have up loaded the photo. Makes it easier to enlarge and view.