Vulval itching is often described as an extremely uncomfortable feeling of irritation, burning or just overall itchiness. Not only is it painful to experience, it can be embarrassing for women to deal with. Vulva itching occurs when estrogen production drops during menopause. Causes of vulvar itching include:

Vulvar infections
Vulvovaginal infections, including common yeast infections can cause itching and are usually brought on by antibiotic and oral contraceptive use, menstruation, pregnancy, uncontrolled diabetes or an immunodeficient condition, like HIV (disease/infection). Other infections like sexually transmitted infections may also have itchiness as a symptom.

Chemical Irritants 
Harsh chemicals like detergents, feminine sprays, perfumes, douches, foams or even latex or seminal fluid /sperm sensitivities can all affect and irritate the vuvlar tissues.

Menopause
When a woman stops her period at the menopause, she may develop atrophic vulvar changes due to a gradual decline in circulating estrogen levels which may in fact cause the vulvar tissues to thin and be more susceptible to trauma. The excessive dryness may also present as itchiness on the exterior genitals.

Other causes may include:
--Any preexisting skin disorders/rashes can also occur on the vulva
--Bartholin's cyst
--Candidal vulvovaginitis
--Contact dermatitis
--Irritation after sexual intercourse 
--Poison ivy
--Skin cancer
--Skin dermatoses
--STD's (e.g., Herpes simplex, Syphilis, pubic lice, genital warts)