Gall tumors are sometimes round & usually near the crown but your plant has some unusual stem growth at the end of pruned stems which may still be gall tumors. I think that is what applestar is referring to. Galls are caused by bacterial infections. If those are galls, consider using agents like Galltrol or Gallex:
https://agbiochem.com/images/Galltrol-Ga ... rganic.pdf
Prune away infected stems and canes and spray with A. radiobacter (spray the soil as well as these tumors also develop below the ground).
If you are not attached to the plant, it may be easier to sanitize by disposing of the plant (in the trash, not a compost pile) and sterilizing any instruments used (try a 10% bleach + water solution). Then dispose of the bacteria laden soil and put new soil in its place.
Note: the plant will not necessarily die from crown gall but will be weakened and have poor growth. Skin breaks probably allowed the bacteria to enter the plant.
Canker is a fungal infection and you can prune off the infected/darkened/purplish/black part of the stems. Cut about 2" below the infected area (approx.). Good sanitation techniques and pruning of stems that cross will help. Blackspot fungicides will also help with canker.