Here is some information I found that should be helpful for you. Vagisil also has a chart on the page where you can match your symptoms to the recommended treatment for it.
The annoying itch: Non-infectious vaginitis
The Symptoms: Usually mild to moderate itching often accompanied by irritation.
Causes: wearing tight clothing -- pantyhose, underwear, tights, jeans
wearing synthetic materials next to the skin which do not let skin breathe
wearing a wet bathing suit
monthly hormonal fluctuations -- your period
allergic reactions and contact irritation from such products as soaps, detergents, spermicides, condoms, and deodorants
dermatological causes such as eczema and psoriasis
Often, you can experience the symptoms of vaginitis without having an infection, which is why the term non-infectious vaginitis is used. However, even in the absence of infection, the irritation and itching can be uncomfortable -- sometimes even unbearable.
Vagisil® Anti-Itch Cream contains benzocaine, a fast-acting anesthetic, that helps stop the itching and the urge to scratch. You get the relief you need and it lasts. Vagisil also has vitamins E, A & D to soothe itchy, irritated skin.
Hope this helps!