Lichen planus is a common chronic inflammatory dermatosis characterized by small, violaceous, flat-topped polygonal papules mostly seen on the flexural wrists and ankles. Several variants of lichen planus have been described based on either morphological appearance, configuration of the lesions or site of the involvement. Moreover, lichen planus is a distinctive dermatosis, in which mucosal or nail involvement may develop in the absence of cutaneous involvement. It has been estimated that nails are affected up to 10% of all patients with lichen planus. The most specific and unique nail finding of lichen planus is the pterygium formation. Pterygium unguis also known as dorsal pterygium refers to a V-shaped extension of the proximal nail fold over the nail plate, which eventually produces permanent onychatrophy. Here, we describe a patient with pterygium unguis, who also manifests atypical mucosal and cutaneous lesions of lichen planus.
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