I hesitate to respond because it is probably not the same but this swelling is very similar to my husband's swelling. He was given steroids and antibiotics that did not help and finally had a PET scan where they found that a residual/recurrant mass was impeding blood flow. His swelling does come and go and this is because the vessels find a way to reroute the blood flow. I hope you find your answer soon along with painless resolution!