Vertically 1–2 cun
Fengshi GB-31 is a major point of the Gall Bladder Channel. Its main function is to treat skin disorders such as itchiness, or red rashes that move around the body, which are caused by Wind-Heat invasion. Together with Zhigou TB-6, it treats herpes zoster as well.
Furthermore, it removes obstructions from the Channel by promoting Qi and Blood circulation in the legs and relaxing the sinews. Thus it treats sciatica, hemiplegia, leg atrophy, numbness of leg or rigidity of knee.