Itching/burning but no infection

I have itching and burning around my inner thighs near the outside of my vagina. The itching and burning comes and goes randomly and I have been to the doctor to get tested for infection. No infection was found and they just gave me an anti-itch cream. I'm not using any new products other than taking a multivitamin and using a new type of under arm deodorant and new toothpaste. Has anyone had this problem?