Dermatitis herpetiformis/Definition

"Rare, chronic, papulo-vesicular disease characterized by an intensely pruritic eruption consisting of various combinations of symmetrical,  erythematous, papular, vesicular, or bullous lesions. The disease is  strongly associated with the presence of HLA-B8 and HLA-DR3 antigens. A  variety of different autoantibodies has been detected in small numbers  in patients with dermatitis herpetiformis." (National Library of Medicine)