Small white insect

[giardiniere]

I need some help indentifying a small white bug on my tomatoes. At first I thought someone in the area had burned something, and the ashes had settled on my tomatoes, but upon further inspection, it wasn't ashes. The bugs don't seem to be harming the plants. There aren't holes or any other damage, they just seem to like it there. I haven't taken any pictures yet, but they are so small, they might not show up anyway. Any ideas??