I once found this damage on my headphones on both sides, it is unclear what caused it, and the continued uses causes the damage to expand. I’m seriously concerned as I’m sensitive to such issues. The headphones are less than a year old.
Solution: Glasses have been the problem, read one of the many replies below for more details.


You can buy replacement earpads for most brands of headphones.
Seconded.
And if they’re not available for this model/brand, switch to another if possible. There are a lot of headphones with replaceable pads, many of them very affordable.
Thank you for the helpful response! /gen