Annual incidences of the other BP180-related diseases MMP, pemphigoid gestationis, and linear IgA dermatosis were reported to be 1.3 and 2.0/million/year, 0.8–2.0, and 0.25–1.0, respectively (21, 26–29). The gene discussed is COL17A1; the disease is linear IgA Dermatosis.