kevinbenoit said:... irregularities on the stem that look like roots are about to come out from its sides ...
I'm not a guy but I can answer part of your question.
The fourth photo shows aerial/adventitious roots.
They are nothing to worry about. If the plant were not supported by a stake/cage the plant would grow flat on the ground and these aerial roots would find there way into the soil.
Those aerial roots begin to grow along the stem when there is excess moisture (heavy rainfall/excessive watering).
