Female reproductive system
This is a common cause of vaginal irritation. The Centers for Disease Control and Prevention says 75% of adult women have experienced one yeast infection at least once in their lifetime. Yeast infections are caused by a fungus in the vagina known as Candida. Other things can cause a yeast infection. Pregnancy, diabetes, weakened immune systems, tight fitting clothing, or douching can also be a cause. Symptoms of yeast infection include itching, burning, irritation, and a white cottage-cheese-like discharge from the vagina. A woman may experience painful intercourse and urination.  Treatment creams can be applied in or around the vaginal area.