A 30-yr-old male had severely itchy papulovesicular lesions over the extremities, knees, elbows and buttocks for one year. Direct immunofluorescence staining of lesions showed IgA deposition in papillary dermis in granular pattern . The most probable diagnosis is:
Dermatitis herpetiformis C/F : Itchy papulovesicular lesions of the extremities, knees, elbows and buttocks. DIF : IgA deposition at papillary dermis in granular pattern known as picket fence appearance.
Pemphigus vulgaris
Bullous pemphigoid
Dermatitis herpetiformis
Nummular eczema
Blistering disorders