PQQ is Pyrroloquinoline quinone. It is relatively new, so people can still claim it does anything and everything, and there are no studies to show otherwise. It is expensive and I noticed nothing, after taking a few months worth, that I could directly associate with taking it. It may have been healthful, it may not. I didn't notice a thing.
I just used it as an example of something I tried with no discernable result.
Iodine and Serrapeptase have both had quick and obvious effects.
While I am not trained in medicine, My self education and testing lead me to reccomend that just the Serrapeptase and Iodine should be able to help your lymph node over time. If you want faster results you might try mixing DMSO 50% and water 50% and applying it directly to the skin over the node and drink a tea spoon of the mixture on an empty stomach, for systemic action.