Skip over broken skin or an ingrown nail.
隱白 Yinbai
“Hidden White” · SP1
Foot Taiyin · 1 of 21 · jing-well
Where. On the big toe, beside the corner of the nail on the inner side.
For. Heavy periods, a full belly, restless dreaming.
Press. Light, steady fingertip-pad pressure, one minute each foot.
Caution. Skip over broken skin or an ingrown nail.
隱白者，木也。在足大指端內側，去爪甲角如韭葉按 · Press with me
Six slow breaths
About a minute. Press as you breathe out, ease as you breathe in.
鄰 · Neighbouring leaves
Where Yinbai Sits on the Big Toe
The dataset gives the address in one quiet sentence: on the medial side of the end of the big toe, 0.1 cun from the corner of the nail. Every word earns its place. Medial is the anatomical way of saying inner — the side of the big toe that looks across at its partner, so that when you stand with your feet together the two medial edges nearly touch. Look down at your own feet and those sides face each other inward: on the right foot the medial edge of the big toe sits on its left side, and on the left foot on its right. The end of the toe is simply the fleshy tip, and the corner of the nail is where the nail frame makes its sharp little turn toward that inner side. The point lives a hair from that corner, in the shallow fold where nail wall and skin meet.
A cun, as ever in this literature, is not a ruler measurement but a proportional one, taken from the body of the person being examined — a thumb-width on a tall adult differs from a thumb-width on a slight teenager. At 0.1 cun, though, the arithmetic almost stops mattering: one tenth of a thumb-width is a sliver, narrower than a grain of rice. In practice nobody measures. You learn instead to see the pale notch tucked against the inner corner of the toenail and to recognise it as the place the old books point to. All that precision is the tradition’s way of saying: right at the corner, not halfway down the toe.
Small as it is, the spot asks for gentleness. A toe tip packs dense nerve supply into tight quarters — it is, in effect, a fingertip for the foot — so sensation there runs bright and close to the surface. Beneath the point lie the bone of the toe’s last segment and the snug bed of the nail, with little padding between skin and structure. Each foot carries a mirror copy of the point, one on every big toe, and the classical maps treat the pair as one address written twice. Locating Yinbai rewards good light and a patient eye far more than pressure.
Finding Yinbai by Eye and Touch
Sit comfortably and draw one ankle across the opposite knee, or simply lean forward and bring the foot within easy view. Look first; press later. Trace the inner edge of the big toenail — the edge toward the other foot — down to the corner where the nail frame turns. Rest the pad of your index finger just beside that corner, in the crease where nail meets skin. Most people feel a faint, dull awareness there, a shy ache quite unlike the sharper protest of the surrounding tissue, and that faintness is itself the confirmation. Give the other foot the same unhurried search.
A few checks steady the hand before real pressure ever begins. Compare sides: the awareness should sit at the same corner on each foot, symmetrical as bookends. Wiggle the toe gently under the resting fingertip — the point travels with the skin, not separately beneath it. If bending down is awkward, prop a mirror by your feet or borrow daylight from a window; good light reveals the pale sliver of the name better than any diagram. If all you feel is hard nail, come off the edge a touch onto the soft fold and search again.
The classic mistakes are mild but worth naming. Hunting back up the toe, away from the nail, lands you in ordinary flesh that answers with nothing — the point hugs the nail corner closely. Pressing with the very tip of the finger rather than the pad turns discovery into discomfort. And confusing Yinbai with its downstream neighbor muddles the map: the channel’s second point, Dadu (SP2), waits further along the course, just past the knuckle at the base of the toe, where the deeper colour of the underside meets paler skin. If your landmark is a joint rather than a nail corner, you have drifted one station astray.
Reading the Name: Hidden White
Two characters carry the whole image. Yin 隱 means hidden or concealed — something present yet withdrawn from easy sight. Bai 白 means white. Together, Yinbai reads as hidden white, and the oldest explanations stay close to the body: at the inner corner of the toenail sits a small crescent where the pallor of the nail meets pale skin, half tucked into shadow, easily overlooked until someone shows you where to look. Commentaries through the centuries have treated the name as a literal description of that glimpse of white at the channel’s very beginning.
A second reading comes from the point’s official rank. The catalogue classes Yinbai as a jing-well point — the well or spring at which a channel’s qi is said to emerge, barely yet, like water finding its first thread at the source. Classical five-phase teaching assigns the well points of the yin channels to wood: the young shoot pushing up through soil. And white, in the traditional colour correspondences, hangs on metal — the phase of the lungs, of autumn, of the breath. Commentators savored the picture: an earth-channel gateway concealing a flash of white at its root, earth quietly holding the seed of what it nourishes. None of this is anatomy; all of it is a memory palace for the fact that this is where a very long channel draws its first breath.
Pinyin renders the name Yǐnbái. The first syllable dips and climbs on the third tone — the falling-rising contour of yin — and the second rides upward on the second tone, bai. Said slowly, the name behaves like the point: a small dip into hiding, then a lift into light. The two hanzi are simple enough to memorise at a glance, and unlike the gates, valleys, and courtyards scattered along the channels, this one names a colour rather than a building — fitting for a point less like an entrance hall than the first pale thread of dawn on a very long road.
Traditional Indications, Explained
The recorded indications read: excessive menstrual bleeding, uterine bleeding, blood in stool or urine, mania and vivid dreaming, infantile convulsions, abdominal fullness, and acute diarrhoea. The opening entries dominate the point’s historic reputation, and the traditional logic is easy to follow. Classical medicine taught that the spleen governs blood — that this organ’s qi keeps blood moving calmly inside its proper pathways instead of straying. When that holding weakened, tradition reached for the root of the channel belonging to the spleen, and Yinbai, first of all its points, stood at the head of discussions of flooding menstruation and kindred bleeding patterns.
The middle of the list looks stranger to modern eyes. Mania and vivid dreaming belong to an old taxonomy in which troubled sleep, disturbing dreams, and disordered spirit were mapped onto the organs — the classics describe the spleen as the residence of thought and reflection, and dream disturbance recurs in well-point discussions across many channels. Infantile convulsions likewise sat in the classical pediatric repertoire of the wells. Abdominal fullness and acute diarrhoea close the list on home ground: digestion is the spleen channel’s central affair, and its first point was traditionally consulted when the abdomen felt stopped or the bowels hurried. Each item records how the tradition sorted the body, not what outcomes followed.
It bears repeating plainly: these are traditional uses, preserved in a licensed dataset and classical literature and offered for cultural and historical understanding. Read against modern medicine, several are urgent warning lights — any unexplained bleeding, unusually heavy or prolonged menstruation, blood in the stool or urine, or a convulsion belongs promptly with a doctor, not with a pressure routine. Where modern research touches self-applied pressure at all, reviews suggest effects are modest and context-dependent, and evidence specific to any single point remains thin. Hold the tradition as a lens, never as a prescription.
Self-Care Acupressure at Home
Settle in seated, with the feet warm — cold toes grip and guard, so tuck them under a blanket or warm them in water first if the season asks. Cradle the big toe of one foot in the fingers of the opposite hand and find the nail-corner point by the walkthrough above. Rest a finger pad — the thumb works well, braced by the curled forefinger beneath — on the spot and begin with contact alone. After a few slow breaths add small, light circles, letting the skin glide over the tight little landscape of the toe’s end rather than grinding against nail or bone. One to three minutes per foot is a generous session; many people prefer a steady, feather-light hold to circles altogether.
Toes are honest about excess: they twitch, they tickle, they try to withdraw. Treat that as feedback rather than obstacle. Anchor the toe gently with your free fingers so the working hand can stay soft; settle the pressure onto a slow exhale; keep the whole exchange nearer to holding a small bird than to testing a fruit for ripeness. An evening rhythm suits this point well — the day finished, feet up, a few unhurried minutes per side — because consistency, not intensity, is what self-care traditions actually reward. Swap feet and finish evenly; the pair likes symmetry.
Keep expectations the size of the practice. Perhaps the area warms; perhaps breathing slows; perhaps nothing announces itself except ten quiet minutes of attention paid to the farthest reachable part of your own body. Every one of those outcomes fits the honest scope of acupressure. What does not fit is escalation — digging harder at a nail corner to force a result, or continuing past soreness. When curiosity pulls toward more, return to gentleness or stop for the day. The point will still be there tomorrow.
Cautions and Safe Practice
The licensed record carries no specific caution entry for this point — the dataset’s caution field is empty — and stating that honestly matters precisely so it is not overstated. An empty field is not a certificate of harmlessness. The universal rules of surface self-care apply in full: fingertips only, no tools or devices; pressure light enough never to bruise; nothing over broken skin, cuts, ingrown nails, fungal infection, warts, or freshly trimmed corners; and an immediate stop on any sharp or electric sensation. Skin and nails around the toes deserve particular respect, because small wounds there heal slowly and complain loudly.
Part of this point’s traditional territory overlaps with modern red flags, and the routing rule is absolute. Unusually heavy or prolonged menstrual bleeding, any unexpected bleeding, blood in the stool or urine, and convulsions — in a child or anyone — call for prompt assessment by a licensed clinician, and convulsions call for emergency care. Acupressure never substitutes for that conversation, before it or after it. Pregnant readers should consult a qualified practitioner before adding any new point practice. People living with diabetes, poor circulation, or reduced sensation in the feet should ask a clinician before making foot work a habit; feet in those circumstances need extra-gentle, medically informed handling.
And the wider rule stands over everything, as on every page of this site: this material is educational, acupressure is self-care rather than diagnosis or therapy, and persistent or frightening symptoms belong with qualified care — medical or East Asian medical as suits the complaint. The safest gift Yinbai offers most people is modest and real: a few quiet minutes of contact at the outermost edge of the channel that tradition credits with holding you together, practiced lightly enough to cost nothing and to risk nothing.
Yinbai — Hidden White — opens the spleen channel at the corner of the big toenail nearest the other foot, where a pale sliver of skin peeks out beside the nail. From this smallest of starting places, classical practice reached for flooding menstruation, restless dreams, and sluggish digestion. This guide covers finding it, pressing it gently, and the limits of self-care.
Self-care limits
Frequently asked
- How do I find Yinbai without knowing anything about cun?
- Ignore the arithmetic and use the nail as the whole map. Trace the inner edge of the big toenail — the side toward the other foot — down to the corner where the nail frame turns, and rest a fingertip in the soft fold immediately beside it. The pale sliver of skin the name celebrates is visible right there in good light. The dataset’s 0.1 cun simply pins the point to that corner with traditional precision; your eyes and a light touch reproduce the same answer.
- Is it really safe to press right beside a toenail?
- For healthy adults, gentle fingertip contact beside an intact nail is reasonable self-care — the toe end is sensitive, so lightness is both safer and more informative than force. Skip the point entirely over broken skin, ingrown nails, fungal infection, or any wound, and stop at once on sharp pain. Anyone with diabetes, circulation problems, or numbness in the feet should clear a foot practice with a clinician first.
- What did classical practice use Yinbai for?
- The traditional record leads with bleeding patterns — excessive menstrual bleeding and uterine bleeding — reflecting the teaching that the spleen governs and holds blood. The list continues with blood in stool or urine, mania and vivid dreaming, infantile convulsions, abdominal fullness, and acute diarrhoea. Those are the tradition’s own categories, documented for cultural understanding rather than as evidence-backed treatment claims — and several map onto symptoms modern medicine wants to examine promptly.
- Why does the whole spleen channel start at a toenail corner?
- Classical channel theory draws the spleen pathway beginning at the big toe, then climbing the inner leg toward the chest — a twenty-one-point journey from the body’s edge to its centre. The well-point framework explains the choice of a first station: qi at a channel’s origin was pictured as barely emerging, a spring’s first thread, so the tradition placed the opening where the flow runs finest, at the extremity. Whatever one makes of the physiology, it makes the toe corner the channel’s ceremonial front door.
- Old texts tie this point to dreams — will pressing it help me sleep?
- The connection is historical: classical medicine grouped vivid dreaming and unsettled spirit among the phenomena its organ maps tried to explain, and Yinbai appears in those old discussions. Treating that as license for a sleep promise would outrun both the tradition and the evidence. A calm evening ritual at the feet may help you unwind the way any quiet routine does; persistent insomnia or troubling dreams deserve a proper conversation with a healthcare practitioner.
- Can pressing Yinbai manage a heavy period instead of seeing a doctor?
- No. Heavy or prolonged menstrual bleeding needs medical assessment — it can signal conditions worth proper investigation, and self-acupressure has no role delaying that. Think of the two as living on different floors: daily self-care is comfort work downstairs; diagnosis and treatment happen upstairs with a licensed clinician. If you enjoy the practice, use it alongside good medical care, never instead of it.
Sources
- 01aijiu-mpvue (MIT License), complateXwInfo.json — Chinese-language location, indications, and point class for this entry.
- 02English wording authored in-house (2026) from the Chinese-language record, following WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008) nomenclature conventions.
- 03Point-name reading and jing-well context cross-checked against A Manual of Acupuncture (Deadman) and WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008).
Last reviewed
牌記This leaf, for machines
Old books ended with a colophon saying who printed them. Every leaf here carries the same facts as structured data for agents and search, with no layout in the way.
- GET /en/points/sp1/leaf.json
- GET /zh-hant/points/sp1/leaf.json
- GET /zh-cn/points/sp1/leaf.json
- /llms.txt — the index of every leaf
- JSON-LD in the page: MedicalWebPage, MedicalEntity and FAQPage
{
"id": "SP1",
"name": {
"en": "Yinbai",
"gloss": "Hidden White",
"zh-Hant": "隱白",
"zh-Hans": "隐白"
},
"channel": {
"id": "SP",
"order": 1,
"of": 21
},
"location": {
"text": "On the big toe, beside the corner of the nail on the inner side."
},
"for": [
"heavy periods",
"a full belly",
"restless dreaming"
],
"press": {
"text": "Light, steady fingertip-pad pressure, one minute each foot.",
"seconds": 60,
"sides": "both"
},
"cautions": [
"Skip over broken skin or an ingrown nail."
],
"source": "Zhenjiu Jiayi Jing, book 3",
"url": "https://acupoints.com/en/points/sp1",
"lastReviewed": "2026-08-24"
}