Bl40 - 委中穴 Located right in the centre of the back of the knee. This point disperses the Bladder meridian in summer and boosts it in autumn. In all seasons, it can treat the following disorders: Dry skin (+). Dry hair (+). Eczema (+), combined with points Bl13 (-) and Bl60 (-). Backache (-). Fungi and Candida albicans (-), combined with points Bl67 (+), Sp5 (+) and Sp3 (-).