The itching inside the pessary is caused by the stimulation of the medication. After using the drug, some of the drug will be absorbed, and some drug residue will be discharged with vaginal secretions, these secretions will easily stimulate the vulva and cause local itching, which is a normal phenomenon, pay attention to wash the vulva with warm water. However, if the itching is severe and the vulva is red and swollen, it may be caused by an allergy to the medication, which can easily cause red spots on the local skin. There are bacterial, trichomonas and mycobacterial vaginitis. Different drugs are used for different vaginitis, and if the drugs used are not reasonable, the vaginitis will be aggravated and the itching will increase. It is best to have a vaginal discharge examination in time and choose the right medication according to the type of vaginitis.