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I would ask for a referral to either a Gyn or dermatologist. It is possible that this is a condition called lichen sclerosis where there is continual itch. Treatment is usually steroid creams however it needs to be diagnosed by a skin sample in order to exclude other problems such as fungal infection.
You should also get a blood glucose test done too in order to rule out any problems with diabetes as this can increase risk of recurrent fungal infections.