Bacterial Vaginosis (BV) is a vaginal infection caused due to a change in vaginal bacteria and pH levels. Some of the symptoms for BV include itching and white, grey & green discharge with a 'fishy' smell.
Sources:
https://www.webmd.com/women/what-is-bacterial-vaginosis
https://www.medicalnewstoday.com/articles/184622
https://www.mayoclinic.org/diseases-conditions/bacterial-vaginosis/symptoms-causes/syc-20352279
https://my.clevelandclinic.org/health/diseases/3963-bacterial-vaginosis