Attachment Last Update September 1, 2018 Extension .pdf Print Code WP85-1498 Location Dickson Building Creator Colposcopy Clinic, QE II Zoon's vulvitis is an inflammation (swelling) of the vulva, also called 'plasma cell vulvitis'. Zoon's vulvitis is not common and the cause is not known. This pamphlet describes the symptoms, diagnosis, treatment, and followup.