LOCATION
On the radial side of the index finger distal to the 2nd metacarpophalangeal joint in a depression at the border of the red and white skin.
Features
Ying/water point, child point .
Body Inches (cun)
Each person has his/her own personal body inches.
One cun is equal to the width of the Knuckle of the thumb.
Nerves, vascular
Radial arteries and veins，radial nerve，proper digital palmar nerves of median nerve.
Indication
Faint，hemorrhinia，toothache，gingivitis，wry mouth，swelling and sore throat，fever，facial paralysis，trigeminal neuralgia。Shown to increase saliva production and to effect the areas of the brain involved in saliva production. Useful for dry mouth (xerostomia).
LI 2 & LI 3 are not used often clinically as LI 4 & LI 11 have broader applications.
Treats excess and clears heat from opposite end of the channel, for toothache, eye redness and pain, gum inflammation, sore throat.
Combinations
Toothache a ：LI 02 & LI 04.
Toothache b ：LI 02 & SI 18.
Toothache，headache，throat
paralysis ：LI 02 & ST 36.
Shaking chill：LI 02 & HT 06.
Pain in the shoulder and back：LI 02 & LI 01 & BL 40 & BL 60.
穴位
微握拳，在第二掌指關節前，橈側凹陷處。
特點
滎（水）穴。
同身寸
針灸取穴比量法。出自《千金要方》。
是指以患者本人體表的某些部位折定分寸，
作为量取穴位的長度單位。
穴區神經血管
自橈動脈的指背及掌側動、靜脈，橈神經的指背側固有神經，正中神經的指掌側固有神經。
適應症
目昏，鼻出血，牙痛，牙齦炎，口歪，咽喉腫痛，熱病，面神經炎，三叉神經痛。
穴位配伍療法
牙痛 a ：1.二間 2.合谷
牙痛 b ：1.二間 2.顴髎
牙痛，頭痛，喉痹 ：1.二間 2.三里
寒慄惡寒：1.二間 2.陰郄
肩背相引：1.二間 2.商陽 3.委中 4.崑崙