Q.tomato plants have yellow flowers
My tomato plants have yellow flowers, but now a fuzzy spot is growing on them. What should I do? My garden has been doing fine. It gets watered every day and has yellow flowers on the leaves now. However, just this week I discovered the fuzzy spots in between the leaves. I hope it isn’t a fungus of some sort. HELP!!!

Sometimes the stems of the tomatoes do look fuzzy, hair almost.
Inspect the plants carefully, turn over leaves and look for insects or bugs. They may lay eggs.
If you see anything treat with Neem OIl.
If you try to remove the fuzzy area does it come off? Do you see this fuzzy spot on other areas of the plant?
This can help you determine if it's plant appearance or an issue to address.
I'm including a few links that may help you identify possible insects or fungus.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-diseases.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tips-for-growing-tomatoes.htm