Lanacane and Vagisil are trademark pharmaceutical brands for the same medicine: benzokaine. Benzokaine is a local anesthetic that blocks the sensitive nerves. Benzocaine is topically used to reduce pain or discomfort caused by minor skin irritations, sore throat, sunburn, teething pain, vaginal or rectal irritation, ingrown toenails, hemorrhoids, and many other sources of minor pain on a surface of the body. Benzocaine is also used to numb the skin or surfaces inside the mouth, nose, throat, vagina, or rectum to lessen the pain of inserting a medical instrument such as a tube or speculum. Benzokaine only reduces the symptoms and doesn’t act on the cause. In the case of a yeast infection, the medication can calm the itching but doesn’t cure the fungal infection. Antifungal cream (clotrimasol for example) should be also used to treat the yeast infection. You may consult a dermatologist to identify the precise reason for itching who can also prescribe you proper medication.