What happen to cause the outside vaginal itchiness?

Many causes: Dry skin, ingrown hair follicle, excess sweat, tight underwear, infrections (yeast, herpes, staph, genital lice), allergy, autoimmune rash, hormonal changes, among others. Best to have gynecologist check.

Visual DX: Hi, it’s hard to say without a picture but there is a great app that may be able to help you get a diagnosis without being seen in person by a dermatologist. The app is called VisualDX and is one of the best, if not the best out there. Many clinicians, including myself, use it. Just snap a photo and it gives you a list of possible diagnoses. Good luck!