MMP9 and dermatitis herpetiformis: MMP9 levels were significantly higher in BP patients (364.79 +/− 41.383) and patients with dermatitis herpetiformis (243.10 +/− 77.110) compared to healthy subjects (52.61 +/− 0.779): P = 0.000002 and P = 0.029907, respectively, Figure 1.