While are an invaluable tool for patient education and early suspicion, they are not a diagnosis. Lupus rashes are a visible manifestation of a systemic inflammatory process involving autoantibodies attacking the skin’s basement membrane.
Malar (Butterfly) Rash: Is It Lupus or Rosacea? - Healthline lupus skin rash pictures
The biopsy must be taken from an active lesion (red, not scarred) that is less than 4-6 weeks old. While are an invaluable tool for patient education