Hello, Thanks for writing to us. According to your information, it could be due to yeast infection (fungal), sweating, dermatitis, tight clothing, pantyhose, g-strings, allergic reaction to bath products etc. Treatment: 1) Use 1% hydrocortisone cream over labia majora and clitoral part. Oral Fluconazole tab may need to take to eliminate fungal infection. 2) Wear loose fitting pants and avoid tight fitting jeans, pants, g-strings. 3) Bathing in bicarbonate of soda - Bathe your vulva once or twice a day for 5-10 minutes in a basin or bath. 4) Don’t use perfumed soaps and bath products. Use 100% cotton sanitary pads and tampons. 5) Lean forward when passing urine - this helps to avoid burning or itching and always wipe or pat from front to back. 6) Maintain genital hygiene properly. Wear clean and cotton underwear. Keep the area always dry. Hope, it helps for you. Take care and Be well.