Perhaps a scar from rubbing on the cage. I often see a bit of damage on my tomato plants where a branch scrapes across the cage either from growth or from the wind. Rarely does it do any harm.

This post was edited by monet_g on Thu, Jul 4, 13 at 10:21

If you're referring to the white growths on the large stem I'd suggest they are what's called adventitious roots, more common on a central stem near the bottom, but can be up higher.

Nothing to worry about if that's what they are,

Carolyn

Just roots. Mine did that too.

I have some kind of eggs in little bowls or nests underneath 1 of my tomato plants on the ground. Does anyone know what they are. They are in clusters all around that 1 plant.

Those "eggs in bowls" are bird's nest fungus. Degrades dead organic stuff. Interesting but not a problem.