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Itchy greenish yellow discharge suggest fungal infection
It could be due to improper hygiene after sex,scratching after perspiration.
You can take monistate,it contains Miconazole
is an imidazole antifungal agent to cure fungal infections.
Take proper local care,use medicated soap for cleaning.
Avoid sex till get complete cure.
If it is recurrent than go for FBS,PPBS,PAP smear
and usg abdomen.
Consult your gynecologist for better guidance and medical management.