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 –: (A) Pemphigus vulgaris, (B) Pemphigoid, (C) Linear IgA disease, (D) Dermatitis herpetiformis
Answer is D. Following information suggest the diagnosis of dermatitis herpetiformis.

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