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Two cases of adult linear IgA disease are reported. They demonstrate the two sites of deposition of IgA at an ultrastructural level: sub-basal lamina and lamina lucida. This finding supports the view that there are subgroups of this disease. Clinical presentation and histological appearance of lesional skin are misleading, and the immunofluorescent appearance is unhelpful in predicting the ultrastructural localization of the IgA deposit.