This is not a nudge, and it could be my eyesight, but,
those marks in the photo could be scoring, a scratch from a stone caught between pad and disk.
If so it 'may' be harmless - ' it will buff out.'
The first mark could be either, the second more likely a scratch, the 3rd looks like a fracture.
If they are fractures, replace immediately, a fracture can spread catastrophically.