I have a reoccuring problem with preservatives in medications, soaps, lotions, skin care products. I have seen a dermatologist who prescribed a good medication but over time it stopped working as well. Now here is my problem I get this severe rash and itching in the vaginal area, and I don't seem to be able to get any help. I have been a patient a Mayo Clinic for this over a year, thought it was gone last week it came back with a vengence. Can you help me/