Dear melmo: It would be unusual to experience lymphedema after the removal of only one node. Further, lymphedema usually affects the arm. It is not uncommon for swelling to occur as a result of the surgery and this can take quite some time to reabsorb, although it is unusual that this would wait six weeks to occur. I am assuming that infection has been ruled out. Chemotherapy would only cause swelling to decrease if the swelling is due to cancer - but this is unlikely if the cancer is not inflammatory. Without knowing more about the cause of the swelling, it is difficult to guess at when it will resolve.