Even though you don't see any spots on the outside of the tomatoes, what you describe still sounds like blossom-end rot or even a small area of sunscald. All that is necessary is a small area, which allows a secondary decay-causing organism to enter the fruit. Decay begins quickly after the organism gains entry into the tomato. Sunscald results when plants are exposed to a combination of heat, humidity, and intense light. Blossom-end rot is associated with a calcium deficiency, fluctuations in moisture, and heavy applications of nitrogen fertilizer. It may not be a lack of calcium in the soil, but rather inconsistent watering that causes the calcium to be unavailable to the plant. The plants need a uniform supply of moisture and mulch to maintain that moisture. Any use of high-nitrogen fertilizer should be discontinued.
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