You already posted the same thing here: https://forums.macrumors.com/threads/iphone-7-flaking.2015528/page-2#post-23995171This also happened to my JB 7 in the last few days. Had the phone 3-4 weeks. No case but always super careful and kept in my pockets on its own with no keys/coins etc. Phone hasn't been dropped and doesn't have a single mark/scratch on it.
It's as if it's chipped or peeled/flaked away? Took it to Apple Genius Bar last night and they refused to accept it was a manufacturing fault and kicked me out the door.
Really disappointed with this.
If anyone else has experienced or heard of this would be interested in seeing what response you got from Apple. Doing a quick search myself this certainly isn't the first JB to do this and always seems to be around the speaker grill.
Why start another separate thread?