I have MGUS was diagnosed last October as well by a bone marrow biopsy. Before diagnosis I had intense random sever itching. I was told to stop my hydroxychloroquine to see if that helps which it didn’t. Then diagnosed with eczema, which it wasn’t. Finally they realized it was from the MGUS. I know take Allegra and no longer have hives and itching. Was diagnosed after an ER visit due to fevers for a month, exhaustion and the platelets of 32 low hemoglobin and low white blood count. MGUS is a watch and wait. I also was diagnosed with CCUS.