CD40LG and systemic lupus erythematosus: In this context, the diagnostic criteria outlined by Camisa and Sharma for diagnosing BSLE encompass: meeting the SLE diagnosis criteria set by the American College of Rheumatology; the presence of vesicles and bullae not confined to sun‐exposed skin; histopathology consistent with dermatitis herpetiformis; absence of circulating basement membrane zone (BMZ) antibodies in indirect immunofluorescence; and detection of IgG, and/or IgM, and frequently IgA at the BMZ in direct immunofluorescence.19, 20