Yes. Replace your rear tire immediately.

Also, have you considered riding somewhere that isn’t straight? You’ve got no meat in the middle, but you’ve got nice, fat, juicy chicken strips on the sides.

It’s probably due to burnouts.

The mark observed is from locking up the tire while braking.

Burnout marks would have it evenly worn and ragged margins, discoloration, chunks missing, blistering, or strips of tire missing along the circumference.