Abstract: Balanitis xerotiea obliterans (BXO) is a chronic atrophic mucocutaneous disorder of unknown etiology.It mainly affects the epidermis and dermal connective tissue of genital and anterior urethral skin of both males and females.Clinically.it is characterized by white papules or plaques on the foreskin and penis that may result in the stiffening of prepuce followed by phimosis and meatal stenosis.Lichen sclerosus is a term used as a synonym for BXO of the glans penis.This paper offers an update on the knowledge about the etiology,pathogenesis,clinical manifestations,histopathology and treatment of BXO.