HelpfulGardener.com

Western NC. Had three weeks and 20” of rain to start the season, and was unable to spray during that time. I knew the disease was coming. But I’ve never seen this. These are the first non-cherry tomatoes to have blushed and they have rotten spots. Clueless about what’s happening.

Tomato anthracnose. It is a problem on growing as well as tomatoes that are being stored and processed.
The rain may have been too hard and too long and the soil could not drain well.

https://tomatodiseasehelp.com/anthracnose-fruit-rot