I think you are referring to female external genitalia, the correct name of it is vulva, to take care of it is to wash it using feminine wash once or twice a day (not more that because you will be removing also the natural flora of this part that helps to fight against foreign microorganisms, you also need to wear clean underwear daily or change your undies daily, and when you wash your undies so to it that it is exposed to sunlight for drying to keep away spores of fungi which might cause itching and other genital problems