Itching and darkening of the vaginal skin.
I’m glad you wrote because this sounds very uncomfortable! First…..itching almost always causes scratching …..and it’s the irritation from the scratching that usually causes the skin to darken (hyperpigment)
I really think you need to see your doctor if you are having that much vaginal itching. There are types of infections (these are NOT sexually transmitted) that are caused by our normal bacteria and normal yeasts overgrowing. For example, for many women, if we take an antibiotic, our normal yeasts will overgrow and cause a lot of itching. Diabetes can predispose women to vaginal yeast infections. These are treated easily by a doctor.
Or for example, bath oils, “feminine hygiene products,” and all sorts of creams and lotions used in the vaginal area, may cause itching, irritation and allergies. It may be you are allergic to a product you may have tried to improve this. Also, some women are allergic to certain laundry detergents and the “dryer sheets” used in clothes dryers.
I’m hoping you can see your doctor right away and have her/him help you with this.