Part 4 of 6 in the "what is cupping" series. Part 1 is what cupping is; part 2 is what happens in one session; part 3 is how the three methods differ; part 5 is which situations to tell your practitioner about; part 6 is aftercare.
"Does a darker mark mean my body is in worse shape?" This is what people searching for "cupping" usually want answered.
The short answer first. A cupping mark is blood under the skin. Not one of the public pages cited here presents "darker means more toxins" as a verifiable fact.
The short version
- The bruising is caused by the negative pressure rupturing the capillaries under the skin, which bleed — that is Kiang Wu Hospital's Chinese medicine department.
- How long: the combined span of three public pages is a few days to about two weeks (section I lists them page by page).
- They look like bruises, but Cleveland Clinic says they are not true bruises that injure muscle fibres.
- The marks themselves fade on their own and need no medication. What needs looking after is a blister, a burn or broken skin.
- The depth of a mark is not a gauge of the state of your body — that is this article's position, not a quotation.
First, the things that cannot wait
If burns, blisters, broken skin, severe pain, or signs of infection develop at the cupping site, please contact your practitioner. If you experience fever, dizziness, or difficulty breathing, call 999 now, or go to the nearest hospital emergency department.
If you are experiencing seizures, loss of consciousness, or high fever, call 999 now, or go to the nearest hospital emergency department, rather than considering cupping.
The full list, and the reason for each, are in part 5. TCM and Western medicine complement each other; it is not a choice between them.
A note: this section is general information only. For conditions like these, follow your doctor's diagnosis and treatment, and seek medical attention when you need it.
I. What a mark is, and how it differs from a bruise from a knock
What the mark is. Cleveland Clinic's account has two steps: the suction first draws fluid into the treated area, and that force expands and breaks open the tiny blood vessels — the capillaries — under the skin.
Kiang Wu Hospital's Chinese medicine department puts it more directly: the bruising is caused by the negative pressure rupturing the capillaries under the skin, which bleed. So the mark is blood under the skin — that sentence is this article's integration of the two pages.
The colour ranges from light pink through deep red to dark purple. The Hong Kong regulator's wording: if the skin shows purplish bruising after cupping, this is generally normal and will fade on its own.
How it differs from a bruise from a knock. Cleveland Clinic: the marks are red and round; although they look like bruises, they are not true bruises that injure muscle fibres.
How long they last. Kiang Wu Hospital's Chinese medicine department (Macau): in general the bruising gradually fades within a few days to a week. Cleveland Clinic: they should fade in a week or two. NHS Tayside's patient leaflet: they can last for several days or weeks. The combined span of the three is a few days to about two weeks.
Why they fade. All three pages say the marks fade on their own. This article's reading: it is blood under the skin and the skin itself is not broken, so what fades is blood, not a wound — that is not a quotation.
How the body clears blood from under the skin, none of the pages cited here explains, and this article does not fill that in for them.
💡 Remember: a mark is blood under the skin, not broken skin. That is why it clears on its own.
II. What the depth of colour means, and whether marks scar
What the depth of colour means. Retention time is tied to the state of the skin: the Taiwan folk-practice manual requires shorter retention for delicate skin, and Puli Christian Hospital says too long may raise blisters. Those two pages speak to time and blisters, not to colour.
The same manual writes the end point of cup retention as: leave the cup until the local skin flushes or the stasis under the skin turns purple-black, then remove it.
In other words, in that manual the colour is the operator's signal that the cup has been on long enough — that is this article's reading of the sentence. Cleveland Clinic's page does not say what determines the colour.
The depth of a mark is not a gauge of the state of your body — that sentence is this article's position, not a quotation. "Darker means more toxins": none of the pages this article cites presents that as a verifiable fact.
Do they scar? The marks themselves fade — that is the Hong Kong regulator's wording, and as above they are blood under the skin. Scarring does appear on Cleveland Clinic's list of risks, alongside skin infection and burns — so what needs looking after is a blister, a burn or broken skin, not the mark itself.
III. Afterwards: how each one is handled
| Situation | What public sources say | Usual handling | When to see a doctor first |
|---|---|---|---|
| The mark (light red to dark purple) | Capillaries under the skin ruptured and bled (Kiang Wu Hospital); generally normal, fades on its own (the Hong Kong regulator); within days to two weeks (the combined span from Kiang Wu and Cleveland Clinic) | Keep clean and dry; no medication needed (Puli Christian Hospital) | Bruising that does not fade → get it seen by a health professional (the Hong Kong regulator); very large or long-lasting → consult a doctor (Kiang Wu Hospital) |
| A small blister | As long as it is not rubbed open, it can be left to absorb naturally (the Taiwan folk-practice manual) | Do not burst it; cover with sterile gauze (Puli Christian Hospital); shorter retention next time (same manual) | A large blister → get it seen by a health professional, to prevent infection (the Hong Kong regulator) |
| Mild soreness at the site | Generally eases within a few hours to a day (Kiang Wu Hospital); you may feel bruised and slightly sore (Cleveland Clinic) | Avoid scratching (if it itches) (Kiang Wu Hospital) | Pain that keeps worsening, or with redness and swelling → seek medical attention promptly (Kiang Wu Hospital) |
| Burn, broken skin, signs of infection (redness, tenderness, yellow discharge) | Burns and infection are listed as risks of improper operation (the Hong Kong regulator) | Cover broken skin with a sterile dressing (the national TCM administration's guideline) | Contact your practitioner; Cleveland Clinic: call your healthcare provider for burns, extreme pain or signs of skin infection. Fever, dizziness or difficulty breathing → call 999 (part 5) |
Dizziness, chest tightness or a cold sweat during the session is "cup fainting" — see part 2.
⚠️ Note: do not burst a blister yourself — that is Puli Christian Hospital's leaflet. Cover it, keep it clean, and if it is large, see a doctor.
The words in this part
All four come from the sources quoted above.
- Cupping marks (罐印) — the red, round marks left on the skin after cupping. That is how Cleveland Clinic describes them. You will hear the word at a clinic.
- Bruising (瘀斑) — the word Kiang Wu Hospital's Chinese medicine department uses for the marks, explaining that it is caused by the negative pressure rupturing the capillaries under the skin, which bleed.
- Capillaries (毛细血管) — the smallest blood vessels under the skin. Cleveland Clinic says the suction expands and breaks them open, and that is where a mark comes from.
- Bruise (瘀伤) — Cleveland Clinic uses the word to draw a distinction: the marks look like bruises, but they are not true bruises that injure muscle fibres.
Frequently asked
How long do the marks take to fade? Kiang Wu Hospital's Chinese medicine department: gradually within a few days to a week. Cleveland Clinic: a week or two. NHS Tayside: several days or weeks. If the marks are very large or last a long time, see a doctor — that is Kiang Wu's wording.
Will the marks scar? The marks themselves fade on their own — that is the Hong Kong regulator's wording. Scarring is on Cleveland Clinic's list of risks, alongside skin infection and burns — so what needs handling is a blister, a burn or broken skin; the mark itself needs no treatment.
Do not: ask for a longer retention time in order to get a darker mark. Too long may raise blisters — that is Puli Christian Hospital's leaflet.
The other five parts
- Part 1: What cupping is: negative pressure, four common methods, and what TCM theory says
- Part 2: What actually happens in one session: minutes, cups, and what it feels like
- Part 3: Cup retention, sliding cupping and wet cupping: what actually differs, and what each requires
- Part 5: Situations to tell your practitioner about first, or to see a doctor about first
- Part 6: Aftercare: showering, air-conditioning, and the day after
👉 If you are unsure whether cupping is suitable for your situation, you are welcome to book an online consultation with HansMed, where a practitioner registered under the T&CM Act 2016 can assess it with you. Cupping is an in-person procedure; the in-person service is coming soon.
Sit with a licensed TCM practitioner from wherever you are.
HansMed Modern TCM
For general wellness education only — not medical advice. Consult a registered TCM practitioner for personal guidance.
Sources
- Cleveland Clinic, Cupping Therapy: Definition, Types & Benefits, last updated 06/07/2023 — https://my.clevelandclinic.org/health/treatments/16554-cupping
- Kiang Wu Hospital (Macau), Department of Chinese Medicine, What to be careful of after acupuncture and cupping — https://www.kwh.org.mo/kwh/article/4205
- Hong Kong Department of Health, Chinese Medicine Regulatory Office, Common Chinese Medicine Therapies — https://www.cmro.gov.hk/html/gb/useful_information/public_health/pamphlet/Health_35780_Booklet_r3.html
- NHS Tayside, Cupping Therapy — Information for patients, leaflet LN1230, reviewed 02/2025 — https://www.nhstaysidecdn.scot.nhs.uk/NHSTaysideWeb/idcplg?IdcService=GET_SECURE_FILE&dDocName=PROD_383478&Rendition=web&RevisionSelectionMethod=LatestReleased&noSaveAs=1
- Taiwan Ministry of Health and Welfare, Department of Chinese Medicine and Pharmacy, operating manual for guasha and cupping in the folk-conditioning trade, page updated 18 December 2025 — https://dep.mohw.gov.tw/docmap/cp-4389-39605-108.html
- Puli Christian Hospital, Department of Nursing, Understanding Cupping Therapy, leaflet T220, dated October 2022 — https://www.pch.org.tw/health_info.php?id=56
- National Administration of Traditional Chinese Medicine and National Health and Family Planning Commission (China), Guideline for the prevention and control of infection related to TCM medical techniques (trial) — http://www.natcm.gov.cn/bangongshi/zhengcewenjian/2018-03-24/838.html
