Last 2 mo. S I've had external vaginal redness itching & internal sharp pain. Gyno said was yeast infection then gardnerella & no relief. Suggestions?

What treatment? Some treatments are more effective than others, and sometimes you can have resistant yeast or bacteria that doesn't respond 100% to the treatment you've been given. I would get re-tested to confirm infection and see if there is a way to get antibiotic "sensitivities" on the organisms that grow. In addition, you may want to find a vaginal probiotic supplement/suppository to build up your defenses.

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Vaginal redness, continual yeast infection, any answers for what this is?

D/W your physician. Yeast infections are due to a fungus called candida which is normally found in the vagina. However, if there is a lack of healthy vaginal bacteria it can lead to overgrowth of yeast. Some causes of overgrowth: antibiotics, ^ estrogen (pregnancy or some birth control pills), malfunctioning immune system, diabetes mellitus as well as friction against vaginal tissues (intercourse) and douching. Read more...