Questioning my Lupus Diagnosis

Hi, I’ve been diagnosed with lupus for over five years and up until seeing a new doctor recently she’s questioning the diagnosis based on lacking a particular blood test. Since being off IV Rituxin, my symptoms have been progressively getting worse since September of last year and now I’ve started breaking out in hives to my face and neck chest and arms that’s itchy and comes and goes. I also have a small fiber neuropathy and I’m wondering if anyone out there has had similar skin issues? I’m going to see a new specialty dermatologist in a month and hoping she will do a punch biopsy of my arm