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A biopsy specimen from the nasal mucosa of a 37-year-old man disclosed a subepithelial accumulation of black granules mainly running parallel to the surface in the absence of any inflammatory infiltrate. Since the mucosal pigment was negative with Perls’ stain and resisted to melanin bleach, an exogenous pigmentation was suspected. The biopsy specimen had been taken because of a diffuse steel-blue...
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