So, I have to assume no one has ever seen this before & it remains a mystery?

You may want to ask on the regular tomato forum.

What did you find out? My own garden tomatoes are fine, but the tomatoes we get from the CSA (local farm) all look exactly like this.

I don't want to contaminate my garden if this is a transmittable disease.

Al

tmadsen - What area are you in? Yours looks like something between too much sun on the fruit and nutrient deficiencies.
What is the plant growing in? Ground? Container? .....?

What about watering? Fertilizing? etc. I suspect that no one is answering your initial post because they need more info.

Hi, Our tomatoes and potatoes have this and even some on the cukes. There is also white spots just under the skin (brown spots on the potatoes). I had a soil test done last spring and it shows a very low pottasium level. I wonder if that could be the problem? Our melons also rot before they get ripe. Help- ozarkjean

Can you give us some photos of the plants and any other symptoms? There is a standard site for mineral deficiencies, but they don't show the fruit, only the plants.