Hi I have gone through your query, i will try to give you suggestion which will be helpful to you.  Based on your description I think you could be having fungal infection. I advise you to get pap smear examination done for confirmation. Meanwhile use candid dusting powder and antihistamine cream locally to prevent itching. Avoid itching as much as possible as it may cause secondary bacterial infection. This provisional advice provided by me is based entirely on the input provided to me. I would suggest examination by the doctor. I hope this suggestion might be of some help to you. I will be glad to help you in case if you have any further queries. Wish you speedy recovery. Take care.