Lichen sclerosus et atrophicus: atypical case simulating lichen planus.

Lichen sclerosus et atrophicus (LSA) is a chronic inflammatory dermatosis, characterized by shiny, atrophic, hypochromic papules with a predilection for the genital and perineal skin. Extragenital involvement may occur, but is rare in the isolated form. LSA more commonly affects prepubertal and postmenopausal women. We describe an unusual case of isolated extragenital LSA, restricted to the wrists and mimicking lichen planus.