Discharge that comes with itching is most often a yeast infection, especially when the two happen together and worsen over a few days. It is very common and treatable, though the exact cause needs a quick examination.
Next Steps
Please see a gynaecologist so the discharge can be looked at and the right treatment prescribed rather than tried blind.
Health Tips
Wear loose cotton innerwear, avoid scented washes and soaps in that area, and keep the skin dry.