They're just highlighting the area; your hand shouldn't actually look like that.
Hoku is supposed to be a powerful, inflammatory pain relief point, the merest pressure being able to knock your pain away like a boxing glove made of Advil. Despite the fact that the previous sentence sounds lifted from a Scientology treatise on anatomy, science totally backs it up ... in a way.
Research shows that a light massage with a piece of ice administered at this juncture is a super-effective painkiller -- effective enough to alleviate pain during the living hell that is giving birth. Women who have been treated with the "honey, let's rub some ice on a very particular spot on your hand" method at the onset of contractions have reported a very noticeable decrease in womb-wrenching pain. Furthermore, this same treatment administered after birth reduced their pain ratings from "distressing" to "discomfort," which might as well be "ecstatic" considering the participants' reproductive parts just basically evacuated a bowling ball.
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"Well, that was a minor inconvenience. I wonder what's on HBO tonight?"
And yes, you need the ice for it to work -- another study focusing on dental pain administered three types of massages to the hoku node: ice massage, regular massage, and regular massage plus the explicit suggestion that it treats toothaches (to see if it was just a psychological thing). Ice massage still reigned supreme, slashing dental pain by 50 percent or more in the majority of participants. So next time your tooth hurts, ditch the Orajel and just hold onto a cold bottle of beer.*