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Palisaded neutrophilic granulomatous dermatitis presenting as an unusual skin manifestation in a patient with Behçet's disease

A 32‐year‐old Korean woman with painful oral ulcers and a sore throat presented with multiple erythematosus papules on both legs. Histological examination of the papular lesions on the legs demonstrated palisaded granuloma with degeneration of collagen fibres in the dermis, compatible with palisaded neutrophilic granulomatous dermatitis (PNGD). This condition is known to be an unusual disease entity associated with various systemic autoimmune diseases, such as rheumatoid arthritis, systemic lupus erythematosus, other connective tissue diseases, and systemic vasculitis. To our knowledge a case with typical Behçet's disease coinciding with PNGD among systemic autoimmune diseases has not been described before.