About 5 days ago I noticed some yellow bumpy patches on the stalks of one of my three tomato plants. It has now overtaken half of one of them and is spreading to the next. It's down to the base of the plant. The part where it's really bad some of the leaves around it have started to wilt. I'm watering every day. I don't notice any bugs, and I haven't had issues with this soil before. What does this look like to you?