Certified GKH Gardening Expert
These are far from normal spots. I'm wondering if all of the soil in these came from the same batch. It is definitely infected. This can happen naturally, or by being over-watered at some point. I would recommend wettable sulfur and dolomitic lime if you do not plan to completely change out the soil. Although, if you do change the soil, you should still add this to be sure that the infection is cured.
@BushDoctor thanks! --James