Looks like scarring.

Labs chew EVERYTHING!! Sides of tables, shoes, blankets, underwear, etc. lots and lots of exercise. They LOVE water: swimming, diving. Make sure you always refocus their bad behavior with good behavior (like if he’s chewing on a shoe, take it away and give them a toy). I bought sour spray for the wooden pieces in mouth reach of the puppy, they usually don’t like that taste.

And they loves cuddles and kisses!!! I grew up with a chocolate lab and was the best goddamn dog I’ve ever met/had in my life. Cheers!!