Again if it is raised on the coin, then it could be a doubled die, in the center of the design. If the area your looking at is incuse, sink into the coin, then it is damage. Possible coin damage from coin contact and reeds from other coins damaging the fields. But as mention, they will be in the center of the design and look like a doubling of the design from the coin. Not random contact marks on the fields that in incuse.