Extra genital lichen sclerosus et atrophicus with cutaneous distribution and morphology simulating lichen planus

Lichen sclerosus et atrophicus (LSA) also known as Csillag's disease, characterized by small, porcelain white, sclerotic areas occur at any site on the skin including mucosa. There is strong association of autoimmune disorders with LSA. Lichen planus (LP) is an inflammatory, papulosquamous disorder characterized by erythematous to violaceous, flat topped, polygonal, pruritic papules distributed mainly on flexural aspects like wrist, around ankles, lumbar region, trunk and neck and also involves mucous membranes, hair, and nail. LP and LSA share similar clinical and pathological features. There have been a few reported cases in the literature of the coexistence of LP and LSA. We reported a case of 39-years-old female having LSA with cutaneous distribution and morphologically simulating LP.