Lichen planus pemphigoides

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Abstract
Lichen planus pemphigoides is a rare condition characterized by blisters arising on normal or erythematous skin in a patient with concurrent lichen planus. It must be distinguished from bullous lichen planus, in which, as a consequence of severe basal cell hydropic degeneration, blisters arise within lichenoid papules or plaques. We present a clinicopathological study of nine cases of lichen planus pemphigoides, and report histological, immunofluorescent, ultrastructural and immuno‐electronmicroscopical observations. We distinguish lichen planus pemphigoides from bullous lichen planus and consider the differential diagnosis. We propose that lichen planus pemphigoides does not represent a homogeneous condition: it may represent a number of bullous dermatoses that develop as a consequence of exposure of different basement membrane antigens following severe damage to the epidermal basement membrane as part of the lichenoid inflammatory process.

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