You really need a doctor to examine you and give you the correct diagnosis. Vaginal sores are not necessarily caused by a sexually transmitted infection. The skin may becomes red, sore, or inflamed after contact with perfumes, detergents, fabric softeners, feminine sprays, ointments, creams, douches. Some skin disorders involve scaly and itchy rashes. Changes that may lead to cancer of the vulva may appear as white, red, or brown patches on the vulva, which may be itchy.