OT, if it's spreading as rapidly as you say, the problem is more than like likely a bacterial infection. Are the spots brown, kind of wet / watery and mushy looking? If they are, cut off the infected leaves with sterilized scissors or a razor blade, and spray the whole plant with RD-20, Physan, or some other kind of bactericide. If you don't have any of those, use listerine, full strength.
Virus infections look like sunken spots on the leaves, sometimes with brown, spirally whorls. When you say "there's no flesh there," is it an actual hole, or more of a flattened-out spot?
Try the listerine and a fungicide treatment first. If the problem keeps up and it actually is a virus, there isn't much you'll be able to do but dispose of the plant, since there's no practical cure for orchid viral infections.