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What is IgA deposits in dermal papilla are characteristically seen in? and explain in detail?
A. Dermatitits herpetiformisDermatitits herpetiformis is diagnosed by a blood test for IgA antibodies, and by a skin biopsy in which the pattern of IgA deposits in the dermal papillae, revealed by direct immunofluorescence, distinguishes it from linear IgA bullous dermatosis and other forms of dermatitis.