My Girlfirend has a yeast infection…..

Yeast is a fungus that normally lives in the vagina in small numbers. A vaginal yeast infection means that too many yeast cells are growing in the vagina . These infections are very common. Although they can bother you a lot, they are not usually serious. And treatment is simple  
A healthy vagina has many bacteria and a small number of yeast cells. The most common bacteria, Lactobacillus acidophilus, help keep other organisms—like the yeast—under control. When something happens to change the balance of these organisms, yeast can grow too much and cause symptoms. Taking antibioticssometimes causes this imbalance. The high estrogen levels caused bypregnancy or hormone therapy can also cause it. So can certain health problems, like…. 
A yeast infection causes itching or soreness in the vagina and sometimes causes pain or burning when you urinate or have sex. Some women also have a thick, clumpy, white discharge that has no odor and looks a little like cottage cheese.  diabetes or HIV infection. 
If you have had a yeast infection before and can recognize the symptoms, and you aren't pregnant, you can treat yourself at home with medicines you can buy without a prescription. You can use anantifungal cream, or a suppository that you put into your vagina, or antifungal tablets that you swallow. If your symptoms are mild, you may want to wait to see if they clear up on their own. Yeast infections are common during pregnancy. If you are pregnant, don't use medicine for a yeast infection without talking to your doctor first.