Yun Bai, or Cloudy White, is a point between the Lung and Large Intestine Channels. The "cloudy white" refers to leukorrhea or vaginal discharge.
Find it like this:
2 cun distal to the acromion process of the shoulder
2 cun anterior to Li 15
This point is often used with Li Bai (44.12), which means Plum White and is considered to be assisting point. Plums can be green, black, or yellowish. This too refers to the color of vaginal discharge.