@tisme my daughter took 5 years at 32 to test positive for Lupus. Did not show antibodies until after childbirth. I was diagnosed with Myasthenia Gravis 8 years after symptoms began. I am what they refer to as seronegative . The known antibodies do not or have not been discovered yet but I have the disease. So yes you can. Get a good rheumatologist. The rash looks like it could be Lupus. Butterfly rash they call it. There is a book by renown Lupus researcher and doctor. Dr. Daniel Wallace.

Your autoimmune markers have to be elevated and high to have autoimmune. I will tell you it’s a very frustrating journey. Mine started in 2002 and was finally diagnosed last year. Took pictures of the task on my face and body showed it to the rheumatologist but all labs in normal level except my sed rate, complement C3 and C4 elevated,
Ana elevated all my inflammatory markers high. Neurologist did a biopsy for small fiber neuropathy and EMG/ nerve conduction test for peripheral neuropathy. Diagnosed with severe axonal sensorimotor peripheral polyneuropathy, dysautonomia, cardiac autonomic neuropathy aka can along with CIDP. They knew mine was autoimmune but couldn’t find the cause. Last year my body decided to go awol I tested positive for lupus, sojourns, Hashimotos and mixed tissue disease. There a bunch of labs that haven’t probably been run on you. I went to see a research neurologist in Boston for answers. These are the labs she had me do before seeing me.