Dermal Hemorrhage: A Clue to Lichen Sclerosus et Atrophicus.

Lichen sclerosus et atrophicus (LSA) may present in a rare bullous and hemorrhagic form that is often difficult to recognize both clinically and histopathologically. Clinically, the lesions may be characterized by atrophic and ivory-white sclerotic plaques in both genital and extragenital regions. Histologically, fully developed lesions of LSA are characterized by a thinned, effaced epidermis with interface change, a wide band of hyalinization in the upper dermis, and a lymphohistiocytic infiltrate below the hyalinized area. Extensive vacuolar degeneration weakens the integrity of the dermoepidermal junction, which contributes to the development of marked edema in the papillary dermis and subepidermal vesiculation. With increased fragility of dermal capillaries, hemorrhage can accumulate within the bullae. Recognizing prominent upper dermal hemorrhage as a secondary change may lead to a prompt diagnosis of LSA. We present a case of extragenital LSA that mimics a dermal hemorrhage clinically and histologically in a 71-year-old Caucasian woman.