The kind of pain your sister is experiencing is important. Burning or searing pain may be indicative of vulvodynia, an elusive condition in which symptoms occur without visible surface changes. Foods containing oxalates, such as berries, may exacerbate this condition, but there are numerous treatments available for it. Itching pain may signal an allergy. The vulvar skin is very sensitive, and reacts to a wide range of allergens including colored or scented toilet paper, fabric softener sheets, soaps of any kind, and nylon underwear.
Women can become allergic to products they have used for many years.
Creams are available to treat allergic vulvitis and, of course, allergens must be avoided. Additionally, the clitoris can grow due to hormonal changes. Women with this condition notice many male hormonal changes in their bodies, including excess hair growth, acne, weight gain, and lowering of the voice. Ovarian tumors can produce similar symptoms. Blood tests can be done to measure male hormone levels and treatments can be prescribed.