What typically causes freckling on tomatoes? This tomato pictured was picked today by a friend, who said that she only notices it on this one tomato, and only on the one plant. Other info: It has been raining this week which also caused splitting; variety is Better Boy; we are in central Pennsylvania.
I think it could be a physiological disorder called gold fleck. According to Jerry Brust, University of Maryland, gold fleck occurs due to deposition of calcium crystals in the epidermal layers of the fruit caused by high stress (like a high infestation of thrips or red spider mites or consistently high (>90°F day, >68°F night) air temperatures along with high dew points (>68°F).