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.


They wear out. The unfortunate thing is that the replacement ear pads don’t tend to last as long. So buy them if you have to, but keep an eye out for new headphone sales over the next few months.
Why would replacement pads be worse?