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What is Extremely pruritic excoriation & papules on buttocks with autoantibodies against epidermal transglutaminase and IgA deposition in dermis on immunohistological examination of normal perilesional skin. Diagnosis is – and explain in detail?
Following information suggest the diagnosis of dermatitis herpetiformis.

Extremely pruritic
Paulo - excoriation
Buttock involved
Antibodies against epidermal transglutaminase
IgA deposition in dermis