Vertically 0.5-1 cun.
Caution: Forbidden to use during pregnancy. Good hygiene to avoid infection. Some classic books don't recommend needling in this point.
Three of the Extraordinary Vessels, Directing, Governing and Penetrating Vessels （Ren Mai, Du Mai and Chong Mai), meets at Huiyin REN-1 from the Interior. In fact, this is how REN-1 gets its name 'meeting of Yin'. Therefore, it is a multifunction point, which is very effective in invigorating Qi and Blood as well as subduing Rebellious Qi in case of mental issues.
Despite its being part of Directing Vessel, some of its symptoms indicate Governing Vessel disharmony, such as epilepsy, depression, haemorrhoids or prolapse of anus.
REN-1 can be used to clear Dampness of the genital area, urethra and anus, so as to treat vaginal discharge, pruritus vulvae or itching of scrotum, urinary difficulty, difficulty in defecation and etc.
REN-1 calms the Mind and open the Mind's orifices as well, so as to treat manic depression. It can also be applied to restore consciousness, especially after drowning.