My basil plant has odd growths on the stems and I can't tell if it is a disease or caused by bugs. I don't know if the plant should or can be treated or thrown away. I also don't know if it's safe to eat the leaves, which currently look healthy.
Unknown Growth on Basil Stems
Certified GKH Gardening Expert
It appears to be Spindle Galls, though it is not something I have seen in Basil until now.
I personally would not eat the Basil and would discard the plant as to not spread this to other plants in the garden.
Here is a link that explains this infestation.