Your wife could be suffering from Vaginitis. It is an inflammation of the vaginal surface usually caused by a Candida (a yeast), Trichomonas (a protozoan) or Gardnerella (a bacterium). A woman with this condition may have itching or burning and may notice a discharge. Treatment may include Sitz baths and instruction regarding proper toilet and hygiene techniques. Treatment taken should be after a visit to a Gynaecologist can include the use of Anti-fungal agents, antibiotics (eg metronidazole) etc. Treatment of sexual partners of patients (in this case you) is essential.