Suggest Treatment For Contact Dermatitis In Vagina With Soreness

I have what my doctor called "Contact dermatitis" in the Vaginal area, and she didn't exactly state what all could help it go away. It's not Itchy, just sore. For the past few months I've been using OTC Vagisil, but it doesn't seem to be working. No I have not had sex, but I have masturbated lot within the past year. Is there something else I could put on it?