In March switched from Vivaglobin to Hizentra for hypogammaglobulinemia related to multiple myeloma. No problems with Vivaglobin, but +/- once a month I form these nodules that last a couple of months and then go away. Two weeks ago switched from 3-site to 4-site, hoping to stop the nodules. Oncologist says the sites got inflamed and calcified. Not painful, but a little sore. Anyone else have this?