A malar ('butterfly') rash across the cheeks and nasal bridge, sparing the nasolabial folds, is classically associated with which condition?

The malar/butterfly rash — erythema across both cheeks and the nasal bridge, characteristically sparing the nasolabial folds — is one of the classic diagnostic criteria for systemic lupus erythematosus (SLE), an autoimmune connective tissue disease that can also cause oral ulcerations and discoid lesions.