Keep in mind the bays on the reverse are level with the fields. So any alteration on the die removing just the least amound of metal, will appear raised on the the edge of the bay. So this is not a
DDR, it is just a die adjustment during polishing issue. Also appear to be a linear plating bubble on the reverse. If the areas on the obverse are raised, then it might be die polishing. But keep in mind that a dried water spot can appear raised, but is just a stain level with the fields. So if the areas are raised, it might be very slight
Feeder Finger Damage, or just a water stain. Can't tell for sure from the images.