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The round marks look like bruising but come from suction, not impact. Here is what the skin is doing, how long the marks last, and when to refuse cupping.

Where this idea comes from

The marks are dramatic and they last for days, and anyone who has seen a photograph of a bruised arm will read them as injury. When athletes appeared with circles on their shoulders, the images circulated without explanation, and the natural conclusion was that something violent had been done to them.
There is a serious concern underneath the confusion, and it deserves to be named. Bruising from a hand is a sign of assault. Cupping marks are produced by suction that the patient consents to, in a pattern the practitioner controls, and the distinction between the two is consent and mechanism rather than appearance.

What Chinese medicine actually says

Cupping uses a glass, bamboo or plastic cup in which a vacuum is created, either by heat or by a pump, and the cup is placed on the skin. The tissue is drawn up into the cup. Classical texts describe it for stagnation and cold patterns, and they place it alongside needling rather than instead of it.
The tradition reads the colour of the mark as information: pale, red or dark, and how quickly it fades. Contraindications are also traditional, and they are practical: broken skin, inflammation, areas over large vessels, and patients who bleed easily. None of this involves striking the body.

What the research says

The NCCIH describes the evidence for cupping as limited, with small studies and inconsistent methods, and lists burns from fire cupping and skin infection among the possible harms. The marks themselves are petechiae caused by negative pressure, not by trauma, and they fade over roughly three to ten days.
Large acupuncture safety surveys report local reactions such as bruising among common minor events, which is consistent with what cupping does to capillaries. Nothing in that literature supports the idea that a darker mark means a more effective session, a claim that appears in marketing far more often than in research. The colour tracks how much suction was applied and how the skin responded, not how much good the session did.

What you can realistically expect

Before the first cup is placed at Centre Équilibre, Ghislaine Morin explains the marks, asks where they may be visible, and keeps them away from the face and neck. Sessions at the centre are scheduled so that marks do not clash with a wedding, a photo shoot or a return to work in short sleeves.
The TCM dispensary she runs at the centre in Grenoble stocks liniments and herbal preparations used after cupping, and the advice that comes with them is unremarkable: keep the area warm, avoid scratching, and let the skin settle. If a mark is painful rather than tender, that is information, not progress.

When to consult, and when not to

Consult only if you can consent to the marks with your eyes open. Tell the practitioner if you take anticoagulants, have a bleeding disorder, fragile skin, eczema or a history of keloid scarring. Mention any area where you have had recent surgery, sunburn or a skin infection, and expect it to be avoided.
Do not accept cupping on broken or inflamed skin, over varicose veins, or on anyone who cannot say no clearly. Do not accept it as a substitute for investigating unexplained bruising, weight loss or fever. And if a practitioner dismisses your concern about marks, that dismissal is the warning sign, not the marks.

Frequently asked questions

Are cupping marks the same as bruises?

Not quite. Bruises come from impact that breaks vessels under the skin. Cupping marks are petechiae drawn up by suction, in a circular pattern that maps the cup. They fade in about three to ten days and are usually tender rather than painful.

Is cupping painful?

The suction feels tight and pulling rather than sharp, and most people describe it as strange rather than sore. It should not be unbearable at any point. If it is, the vacuum is too strong or the cup should be moved, and saying so is part of the treatment.

When should cupping be avoided?

Avoid it on broken, inflamed or infected skin, over varicose veins, and on anyone taking anticoagulants or with a bleeding disorder. Fragile skin and a tendency to keloid scarring are also reasons for caution. Unexplained bruising needs a doctor, not a cup.

Useful links

Sources

Is acupuncture just attention? What placebo research can tell usDoes moxibustion burn the skin? What the technique actually involves
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Ghislaine Morin
Ghislaine Morin
Praticienne en médecine traditionnelle chinoise et sophrologue à Grenoble
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