I don't know if you're for or against sprays, but I would use Daconil immediately on the foliage. The damage to the tomato is an insect that bores in. A garden pest spray would reduce further damage there.

But don't trash the fruit. The fruit has been "injured", not spoiled. Most folks would cut around those areas when there are only a few, which is not the case with yours.

If nothing else, harvest seeds for next year when it begins to ripen (a little blush of color).