Tomato spots

Does anyone know what happened here? A few of my tomatoes are mottled with chocolate brown spots. I've never seen this before. I'm guessing a mold or virus of some kind. Maybe from too much water. I've been lucky this year with no end rot, minimal cracking and nicely shaped tomatoes. This at the cost of a water bill twice my normal (aarrgh!). My guess is the brown is from too much water. Any ideas?

Solanum lycopersicum