What Causes Itching And Redness In Genital Area?

I have a seven year old daughter. Over the years her genial area has gotten red and itchy which I assumed was a minor yeast infection. A couple of days of baths always cleared it up. Late week however her vaginal area was very red and the next day I discovered she has three pimple-like bumps in her inner bum cheek. It has been four days and while the redness has subsided she is very itching and is constantly still scratching which once again make the area red. I am taking her to the doctor tomorrow but I very worried about what this might be.