On the laterodorsal aspect of the knee, 1 cun superior and 1 cun lateral to Weizhong BL-40 which is in the center of the popliteal crease.
It is also 1 cun above Weiyang BL-39, on the medial side of the tendon biceps femoris muscle.
How to locate
First flex the knee slightly in order to reveal the popliteal crease.
Then force the knee against resistance so that the tendon of the biceps femoris muscle becomes more pronounced and visible.
Fuxi BL-38 is located 1 cun superior to the knee joint on the medial border of the tendon.