Certified GKH Gardening Expert
I see, what appears to be, bacterial blotch. This can happen when the soil remains too wet for too long, and doesn't get a chance to dry out some.
This will need to be treated with a bactericide. This article will help:
Biofungicides can help to keep the soil from contracting infections:
I would, also, recommend amending the soil to lighten it up a little. This article will help: