Zoon vulvitis or vulvitis circumscripta plasmacellularis is a rare chronic inflammatory disease characterized by well-delimited and shiny erythematous plaques that can affect any location of the vulva. It usually occurs in postmenopausal women and poses a difficult differential diagnosis. The need for a vulvar biopsy is emphasized to obtain a certain histological diagnosis. The case of a 36-year-old patient is presented and the current therapeutic options described in the literature are discussed.