CD40LG and systemic lupus erythematosus: Camisa and Sharma proposed criteria for this distinct subset of vesiculobullous skin lesions occurring in patients with SLE [89]: a diagnosis of SLE based on American College of Rheumatology criteria [90]; vesicles and bullae arising upon but not limited to sun-exposed skin [91]; histopathology compatible with dermatitis herpetiformis [92]; negative indirect immunofluorescence (IDIF) for circulating basement membrane zone antibodies [93]; direct immunofluorescence (DIF) positive for IgG and/or IgM and often IgA at the basement membrane zone.