Itching of the vulva is not recommended to be washed with salt water. There are many possible causes of vulvar itching, including trichomoniasis, mycotic vaginitis, bacterial vaginitis, mycoplasma infection, chlamydia infection, etc. Washing with salt water can change the pH value of vaginal and vulvar secretions. It is best to go to the hospital for laboratory tests or internal examination to clarify what kind of infection it is before using targeted medication.