Erythema dyschromicum perstans is a cutaneous pigmentary dermatosis of unknown etiology chararcterizd by asymptomatic macules of an ashy gray color which was first presented by Ramirez. We reported a case of Erythema dyschromicum perstans in 57 year old female patient. The skin lesion were characterized by the presence of discreated or confluented bluish-gray colored pigrnentation on the lateral surface of hoth upper extremities. Histologically, the lesion showed hydropic degeneration of the epidermis witb in continence of pigmcnt and an apperence of malanin-hearing macrophages in upper dermis which are compatible with Erythema dyschromicum perstans.