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The diagnosis of systemic lupus erythematosus
(SLE) must be based on the proper constellation of clinical findings and laboratory evidence.
Patients with SLE may present with any combination of clinical features and serologic evidence of lupus.a patient is classified as having SLE if the patient has biopsy-proven lupus nephritis
with ANA or anti-dsDNA antibodies
or if the patient satisfies 4 of the diagnostic criteria , including at least 1 clinical and 1 immunologic criterion.
you have a malar rash
you can get the immunological tests done like ANA or anti-dsDNA antibodies and if they are positive,then diagnosis can be confirmed.
hope this will help you!