HELP! tomato problem

[Barmychick]

Hi there, just been looking at my outdoor beefsteak tomatoes and come across one that seems to have either mold or something else eating away at the stem, can someone give me a clue as to what it is and if i can help save the plant or is it a gonner??

The rest of the plant looks healthy and is starting to sprout flowers now

[DavidT]

They look to me very much like root nodes. Just keep an eye on it for now, but keep us posted.