Resumo

TOBIA, S et al. Flat LichenPigmented:Clinical case. Rev. argent. dermatol. [online]. 2019, vol.100, n.3, pp.71-80.  Epub 30-Set-2019. ISSN 1851-300X.

The Pigmented Flat Lichen is a frequent chronic dermatosis of etiology still unknown, clinically characterized by the presence of purpuric, polygonal, pruritic papules distributed symmetrically. The Pigmented Flat Lichen represents one of all clinical variants, where the distinctive histological feature is melanin pigment incontinence. Its course is self-limited, it resolves over a period of months to years, but it can persist indefinitely. There are multiple treatment options that include topical, intralesional and systemic corticosteroids, retinoids, phototherapy, topical immunomodulators and in severe or resistant cases to treatment, cyclosporine, methotrexate. Dermatoscopy is a non-invasive diagnostic auxiliary technique that allows accelerating diagnostic certainty in various skin diseases; in the case of the Pigmented Flat Lichen, the classic lesion is observed, consisting of a flattened polygonal papule, with an erythematous-violet hue that usually has fine adherent scales on the surface, called Wickham striae, which consists of whitish polymorphic structures and that corresponds histologically to areas of orthokeratosis. It is a very useful tool for the diagnosis of these lesions.

Palavras-chave : Lichen Planus Pigmented; polygonal papules; dermatoscopy; Wickham stretch marks.