San Francisco, CA · Outer Richmond

What Is Cupping Therapy? The Marks, the Claims, and the Evidence, Explained

An honest, plain-language guide from a licensed shiatsu and glass-cupping studio in San Francisco's Outer Richmond

Cupping therapy is a traditional practice in which a therapist creates suction on your skin with a cup, and the round marks it can leave are pooled blood from tiny ruptured capillaries — the same biology as a bruise — not toxins. This is the explainer we wish more cupping studios published: what the practice is, what people actually use it for, why the marks happen, and what the published evidence does and doesn't support. We run a shiatsu and glass-cupping studio on Balboa St, so we have a stake in this — which is exactly why we'd rather tell you the honest version before you book.

What Is Cupping Therapy? The Marks, the Claims, and the Evidence, Explained — Quick Facts

Cupping price $40 on its own, or from $95 added to a massage
Method Dry glass fire cupping — the skin is never pierced
What the marks are Pooled blood from tiny capillaries, like a bruise — not toxins
Marks fade in About 3 to 7 days
Time before an event Book 7 to 10 days ahead so marks clear
Studio Rated 4.9 from 238 reviews · Outer Richmond 94121
Warm glass fire-cupping cups resting on a clean towel in a treatment room at Healing Shiatsu in San Francisco's Outer Richmond

Cupping Guide

The marks are the whole story. A swimmer climbs out of a pool with purple circles down his shoulders, the photo travels, and cupping gets described as ancient, powerful, and proven. Then you read what the federal research body actually publishes about it — and it's almost entirely about safety. That gap is worth sitting with before you book.

What Is Cupping Therapy and How Does the Suction Work

Cupping is a practice used in traditional medicine in several parts of the world, including China and the Middle East. The mechanics are simple. A practitioner places a cup — glass, ceramic, bamboo, or plastic — on your skin and creates suction inside it. There are two ways to do that. The older method, and the one we use, briefly applies a flame to warm the air in a glass cup, then presses the cup to the skin; as the trapped air cools and contracts, the negative pressure pulls skin and surface tissue up into the cup. The newer method skips the fire and attaches a suction device after the cup is in place.

The suction is the point. A massage therapist pushes down into tissue. Cupping pulls it up, and that pull is what draws a little blood toward the surface. The pooled blood under your skin is what you're looking at when you see the marks. It's a different sensation from thumbs or elbows — many guests describe it as a deep, satisfying stretch — and that's a fair reason to try it. It just isn't evidence of anything more than what it is.

The marks are pooled blood from tiny ruptured capillaries — the same biology as a bruise. A darker circle is not more toxins. It's just a bruise that suction made round.

Dry Versus Wet, and Why Glass Fire Cupping Stays on the Surface

The single most important distinction in cupping is whether the skin stays intact. The line is one sentence: in wet cupping, the skin is pierced and blood flows into the cup; dry cupping does not involve piercing the skin. That's a bigger gap than it sounds. Dry cupping leaves a bruise-like mark. Wet cupping is, by design, a procedure that opens the skin and deliberately draws blood, which moves the conversation from 'discoloration' to 'open wound,' with the heavier risks that come with it.

We do glass fire cupping, dry only. No incisions, no bloodletting. If a studio can't tell you plainly which one they do, settle that first — and either way, ask whether the equipment is single-use or sterilized between people. Because suction alone can break enough surface vessels to leave blood on the gear, that sterilization question matters for dry cupping too, not just wet. It's not an upsell. It's the line between a treatment and a way to pass something between clients.

Why You Get the Circles — and Why the Color Is Not a Diagnosis

The marks are not impact bruises, and they are not toxins being pulled to the surface, whatever the marketing says. Suction inside the cup ruptures tiny blood vessels just under the skin, and a little blood leaks into the surrounding tissue. The result is a flat, round patch — pink, red, sometimes nearly purple-black — tracing the rim of the cup. Same biology as a bruise, produced by negative pressure instead of a blow. They typically fade in three to seven days.

You'll often hear that a darker mark means more 'stagnation' or more toxins. It doesn't. How dark a mark gets depends mostly on how easily you bruise, how thin the skin is there, and how long and how strongly the cup sat — not on the state of your insides. We won't read your back like a fortune teller. One practical note worth borrowing from the federal fact sheet: mention your marks to any health care provider who sees them, so symmetrical circles aren't mistaken for signs of abuse. Say it up front and you spare everyone the detour.

What the Evidence Shows, and How We Talk About It Here

Here's the part the photographs skip. The NCCIH cupping fact sheet lists no conditions the practice treats and cites no trial demonstrating that it works. When a research body that exists to evaluate practices like this declines to make any benefit claim, that silence is itself a finding. Acupuncture, a far more heavily studied practice from the same tradition, lands in a mixed middle — some real effects on certain chronic pain, plenty of placebo signal. Cupping sits well below that, with far less rigorous study behind it.

So the honest reading is neither 'cupping is proven' nor 'cupping is useless.' It's that the evidence needed to say either is largely missing, and that whatever relief a session brings may owe a good deal to expectation, attention, and the plain comfort of lying still while someone tends to your back. That's a real effect for the person feeling it. It's just not a proven physiological treatment, and we keep that difference straight. We won't tell you cupping detoxes you, flushes anything, improves circulation to heal you, or treats disease. We'll tell you many guests find it relaxing, that it pairs well with shiatsu, and that it belongs alongside sleep, hydration, movement, and real medical care — never in place of them. This is general health education, not medical advice; if you take medication, are pregnant, have a skin condition, or bruise easily, talk it through with your own clinician first.

What Sets Us Apart

Why Choose What Is Cupping Therapy? The Marks, the Claims, and the Evidence, Explained

1

Suction, Not Pressure

A massage therapist presses down into tissue. A cup pulls skin and surface tissue up. That upward pull is the whole mechanism — and it's what produces the marks.

2

Marks Are Pooled Blood

The circles come from tiny vessels breaking under the suction and blood leaking into the surrounding tissue. Same as a bruise. They fade in 3 to 7 days. They are not toxins leaving the body.

3

Dry, Glass, Non-Piercing

We do traditional glass fire cupping: a flame briefly warms the cup, then it goes on the skin. The skin is never pierced. We do not do wet cupping or bloodletting.

4

A Comfort Practice, Not a Cure

The federal NCCIH cupping fact sheet lists no conditions cupping treats. We treat it as a low-evidence traditional comfort practice that complements rest and care — never replaces medical treatment.

Who This Massage Is Best For

  • Curious first-timers researching cupping before booking anything
  • People who saw cupping marks online and want to know what they actually are
  • Anyone told cupping 'removes toxins' who wants the honest version
  • Office and desk workers weighing cupping for everyday neck and shoulder tension
  • Runners and cyclists wondering if cupping fits a recovery routine
  • Cautious bookers who want to understand contraindications first
  • People with an event coming up who need to time the marks
  • Guests deciding between cupping alone, shiatsu, or the combo

What to Expect in Your Session

  • A short check-in about your health, medications, and any skin conditions
  • Glass cups warmed briefly with a flame, then placed on the skin — never piercing it
  • A firm pulling or deep-stretch sensation, not pain; speak up and we adjust or remove
  • Round marks that range from pink to deep purple and fade in 3 to 7 days
  • An honest framing of cupping as a traditional comfort practice, not a medical cure
  • A reminder to mention your marks to any clinician so they aren't mistaken for something else
  • No claims that cupping detoxifies, flushes toxins, or treats disease

Visit Us

Our Location in the Outer Richmond, San Francisco

3735 Balboa St, San Francisco, CA 94121

(415) 379-9739

Monday – Sunday: 9:30 AM – 7:30 PM

· We're at 3735 Balboa St, between 38th and 39th Ave in the Outer Richmond

· Open Monday through Sunday, 9:30 AM to 7:30 PM — call (415) 379-9739 with questions before booking

· Rated 4.9 across 238 reviews, so you can read other guests' experiences before you decide

· The 38 Geary bus stops a block north on Geary if you'd rather not park

· Book about 7 to 10 days before a wedding, photoshoot, or beach day so any marks fade in time

· Wear or bring a loose top — we need back access, and afterward it's easier to stay covered and warm against the fog

· If you take blood thinners or have a skin condition, mention it when you call so we can advise honestly

Evidence-Based

Sources & Further Reading

Claims on this page draw on guidance from leading health and research institutions. Explore the primary sources below.

These references are for general education. Massage and cupping are complementary therapies and not a substitute for medical diagnosis or treatment. Consult a licensed healthcare provider for medical concerns.

What Is Cupping Therapy? The Marks, the Claims, and the Evidence, Explained — Common Questions

What is cupping therapy, in plain terms?
A therapist places a cup on your skin and creates suction inside it, which pulls the skin and the tissue just under it upward. We use traditional glass fire cupping: a flame briefly warms the cup, then it's placed on the skin (the skin is never pierced). The pull is the whole point — it's the opposite of a massage therapist pressing down.
What are cupping marks, and do they mean toxins?
No. The marks are pooled blood from tiny capillaries that rupture under the suction — the same biology as a bruise, produced by negative pressure instead of a bump. They are not toxins, 'stagnant blood,' or anything leaving your body. The color mostly reflects your skin, how easily you bruise, and how the cup sat, not the state of your health.
Does a darker mark mean more toxins or more stagnation?
That's a popular myth, and it isn't true. A darker mark does not mean a sicker body or more 'stagnation.' How dark a mark gets depends on things like how easily you bruise, your skin, and how long the cup stayed — not on toxins. We won't read your marks as a health diagnosis.
Does cupping actually work? What does the evidence say?
Honestly, the high-quality evidence needed to say cupping treats anything is largely missing. The federal NCCIH cupping fact sheet lists no conditions it treats and cites no trial showing it works. We treat cupping as a low-evidence traditional comfort practice — many people find it relaxing and like the deep-stretch feeling — and never as a cure or a substitute for medical care.
How long do cupping marks last?
Usually three to seven days, fading like a bruise from purple to yellow-green before clearing. If you have a wedding, photoshoot, or beach day, book about seven to ten days ahead so the circles have time to go.
What's the difference between dry and wet cupping?
Dry cupping uses suction only and never breaks the skin — that's what we do. Wet cupping deliberately pierces the skin to draw blood, which is a different, higher-risk procedure with its own licensing. We do not offer wet cupping or any bloodletting.
Is cupping safe, and who should avoid it?
Done by a trained person with clean, single-use or sterilized equipment, dry cupping is generally low-risk, though it can cause lasting discoloration, skin irritation, or worsen eczema or psoriasis. Skip it or check with us and your doctor first if you take blood thinners, have a bleeding disorder, bruise easily, have fragile or broken skin, an active skin infection or open wound, or are pregnant. Don't cup over a fresh injury.
What should I not do after cupping?
Keep the area covered and warm rather than exposing fresh marks to cold fog or drafts, go easy on alcohol and hard workouts for the rest of the day, and don't scrub or pick at the marks — let them fade on their own. Also mention the marks to any clinician who sees them so they aren't mistaken for something else.

Ready to feel better?

Book your Shiatsu massage or cupping therapy session today — walk-ins welcome 7 days a week.