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The cause for repeated infections could be the lube, your partner re-infecting you or the STD. A careful examination along with culture test would help in identifying the infection and treat it effectively. Avoid using lubes and also get your partner also treated simultaneously and avoid having intercourse while being in treatment course to prevent chances of re-infection.
Discuss with your gynecologist about your partner also getting treated simultaneously.
Oral medications along with topical application of creams help.
Take care.