Vaginitis is a very common complication of little girls. This starts as an inflammatory reaction to an irritant that comes into contact with the vagina. This makes the vagina red and inflamed. Due to the inflammation, the girls may scratch their vaginal area. The vagina may become infected with bacteria, which then increases the inflammation. To take care of this, you have to remove any offending irritant that may come in contact with your child's vagina.