Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Dermatitis Herpetiformis: Skin Manifestation of Celiac Disease (For Health Care Professionals) ?
    ### Response:
    Dermatitis herpetiformis is caused by the deposit of immunoglobulin A (IgA) in the skin, which triggers further immunologic reactions resulting in lesion formation. DH is an external manifestation of an abnormal immune response to gluten, in which IgA antibodies form against the skin antigen epidermal transglutaminase.
    