I so totally agree with your philosophy of not freaking out when one finds ONE bug, or a couple of questionable leaves on outdoor plants or gardens. However, one is particularly careful when growing crops in g'houses where there is little to no room for error when first sees a disturbing sign. I've seen whole g'house crops go to expensive, and sometimes ineffective treatment to cure crop of diseased plants simply because the operator did not do due diligence in scouting and catching a disease when it was present in just a few plants sitting on benches of a monoculture. I scouted daily, but when I found something I thought wasn't 'right' but was unsure of the reason, it got quarantined away from other plants until I could ascertain what was going on, or treat it. It allowed me to run my operation without a lot of failure or chemicals. The poster should keep an eye on this, as my first take is if it isn't minor insect damage or environmental, it may be virus.

I have updated because I meant to post a picture of the bug and not the same picture of the leaf twice. They are mostly all little green bugs but some are a little larger and red. They can be seen with the naked eye and look kind of like a cross between spider and grasshopper. Only tomatoes are affected, I don see any on peppers or herbs.

Thanks for the advice. This is rather a late update but I just wanted to say that soon after I posted this, I potted the tomato in a large container and kept it outside on my apt balcony. The white spots quickly went away on their own. I guess it just needed sunshine and better air circulation!

There was no insect damage. No any other blemish on the surface. Today I tossed another big tomato of the same variety (Mashenka) with the same symptoms. Did not even cut and looked inside. This type of fruit damage usually happens to me in autumn, when the days become cooler and we have morning dew. And it happens more often on certain varieties, with thin skin and soft flesh, such as Malachite box from the last year. I never had BER on my tomatoes. The leaves by now started to show the moderate signs of septoria and I started to spray them regularly. I was thinking that it might be Gray mold, but was not sure enough because it did not look exactly as on the pictures. And it never had any gray fuzz on the surface. It seems that the decay starts inside and it works its way outside appearing as rotten wet spots, which leak liquid excessively and probably spread the infection. So right now I think that it is some kind of fungus and I will spray accordingly. Maria.