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she is ave year old? How old is she?
Sorry for the delay because there was emergency. There are some possibilities. Vaginal trauma, tumor, vaginal foreign body, infections, lichen sclerosus, urethral prolapse, genital warts. It is possible that the bleeding is due to infection. If the vaginal culture is negative and vaginal bleeding remains unexplained, vaginoscopy should be undertaken. Studies suggest that vaginoscopy has considerably better diagnostic sensitivity than does non-invasive imaging (ultrasound, computed tomography [CT], magnetic resonance imaging [MRI]), for the diagnoses of foreign body and malignancy. Vaginoscopy refers to use of an instrument, other than a speculum, to visualize the vaginal canal. It is used most often for examination of children.
On average, menarche occurs about two and a half years after the onset of breast development. Precocious puberty is less likely. Of the bacteria that cause vaginitis in girls and women, two are particularly associated with bleeding: Streptococcus pyogenes (group A beta-hemolytic streptococci) and Shigella species. Infections with group A streptococci occur mainly in prepubertal girls. Similarly, Shigella vaginitis has not been reported in girls over the age of 10 years. Candida infection doesn't cause genital bleeding. Intravaginal hemangiomas and Müllerian papillomas can produce vaginal bleeding in infancy or childhood. Episodic vaginal bleeding that remains unexplained after thorough diagnostic investigation has been reported in girls who are either prepubertal or early in the pubertal progression.