Of the 36 cases in the other bullous disease group, six (linear IgA bullous dermatosis, n = 1; dermatitis herpetiformis, n = 1; viral infection, n = 2; bullous SLE, n = 1; and Stevens-Johnson syndrome, n = 1) showed linear deposition of IgG upon IHC staining. The gene discussed is CD79A; the disease is viral infectious disease.