Areas of epidermal necrosis
Inflammation localized to papillary tips
Classification Variants, Mutations, and Other:
■ HLA A1/B8/DR3, DQ2 common (95-100%) in dermatitis herpetiformis
■ Increased incidence of GI lymphoma and non Hodgkin lymphoma
■ Hypochlorohydria and atrophic gastritis (antiparietal cell antibodies); pernicious anemia associations
■ Other associations: thyroid disease (thyroid microsomal antibodies) and other autoimmune diseases (dermato-myositis, myasthenia gravis, rheumatoid arthritis, and lupus erythematosus)
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