Thanks for writing to us.
From the description it seems you could be having candidal vulvovaginitis( yeast infection). In such cases intake of fluconazole
150 mg along with aplication of an antifungal cream like clotrimazole
over affected area helps in clearing the infection. To alleviate itching, you may take cetirizine
for few days. Clean the area with plain water only, avoid using soaps, detergents and dettol
Hope this helped.