Extra point · Upper Limb
Two Whites
二白Èr BáiAnatomical location
4 cun proximal to the wrist crease, on both sides of the palmaris longus tendon (two points).
Same point as 114PC · Èr Bái — Curious Points catalogMain function
Regulates the Large Intestine, stops bleeding.
Therapeutic indications
- Hemorrhoids
- rectal prolapse
- forearm pain
Name and classical tradition
Erbai, 二白, are the “two whites.” 二, two: there are two points on each forearm, one on each side of the palmaris longus tendon, four cun above the wrist crease. The 白 in the name has no certain explanation in the texts.
The Zhenjiu Dacheng (Great Compendium of Acupuncture and Moxibustion) describes both: “二白四穴…在掌後橫紋，中直上四寸，一手有二穴，一穴在筋內兩筋間，即間使後一寸，一穴在筋外.” Four points across the two hands: one between the tendons, one cun behind Jianshi, PC5, and another outside the tendon. Its indication is very specific: “治痔脫肛,” hemorrhoids and rectal prolapse, and that is how it has continued to be used.
