I having itching down there, but no signs of a yeast infection. What else could it be caused from?

Any irritant. Hpv, dysplasia(precancerous change), bacterial vaginosis, lichen sclerosus, genital shaving, irritation from the tissues rubbing against other tissue (obesity), several dermatologic changes. For non infectious sources a topical steroid is the treatment, for infection the appropriate antibiotic if bacterial, virus has to be addressed by immune system or aldara (imiquimod).