** Thanks for contacting with your health concern 1. It is very unfortunate to hear that she is suffering from CP [cerebral palsy] and since there is no definite/fruitful treatment in medical science thus physiotherapy and occupational therapy is the mainstay of treatment. 2. Now coming to your present query, since she is a diagnosed case of CP thus is vulnerable to infection most of the time, so check with an OBG/GYN doctor to evaluate whether it is a pimple [contact dermatitis/folliculitis] or something else. PS. although genital herpes is transmitted through sexual contact [ as it is absent], make sure to exclude other routes of infection [anus/skin/oral]. 3. If you are concerned about the same have your doctor/nurse check out these, who can advise on prognosis and available treatments, till then maintain her good hygiene [regular washing of vaginal area, choose cotton undergarments and avoid fabrics]