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Blood collecting under the wound: haematoma | CION Cancer Clinics
If you notice a haematoma after surgery, show it to your surgical team. A small, firm, bruised lump of blood under the wound usually clears on its own over some weeks. A swelling that grows quickly, feels tight or bleeds through the dressing needs to be seen the same day. A growing neck swelling with any breathing trouble is an emergency. This page explains what to watch and what the team does. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What should you do about a haematoma after surgery?
- Is it just bruising, or a haematoma that needs attention?
- Why does blood collect under a wound?
- What happens once the team sees it?
- Which words might you see on your notes?
- What do families often believe about a haematoma?
- Common questions about haematoma after surgery
The short answer
What should you do about a haematoma after surgery?
Show it to your surgical team. A small haematoma, a firm bruised lump of blood under the wound, usually goes away on its own over some weeks. One that grows quickly, feels tight, or bleeds through the dressing needs to be seen the same day.
What a haematoma is
After an operation, small blood vessels can keep oozing under the skin. Instead of draining away, the blood pools into a pocket. You see a swelling, often with dark purple or blue bruising around it, that feels firmer than the skin nearby.
When it usually appears
Most show up in the first day or two, often while you are still in hospital. Some appear after going home, especially after a drain comes out, after straining, or in people taking blood thinners.
What this page cannot tell you
It cannot tell you how big your haematoma is or whether it needs draining. From the outside, blood, clear fluid and infection can look alike. The team may need to examine it or use an ultrasound to decide.
Bruising that spreads down the skin below the wound over a few days is common. Blood moves with gravity as it clears.
!
When a swelling cannot wait
After an operation on the neck, such as the thyroid or voice box, a swelling that grows with any difficulty breathing, noisy breathing or trouble swallowing is an emergency. Call an ambulance or go to the nearest emergency department at once. For any wound, if a swelling grows fast or blood keeps soaking through, press firmly on it with a clean folded cloth and go to hospital the same day.
Not sure whether this applies to you?
Ask an oncologistRecognising it
Is it just bruising, or a haematoma that needs attention?
The size, the speed and how tight it feels matter more than the colour of the skin.
Ordinary bruising
Flat purple, blue or yellow patches around the wound, with no real lump. It fades through green and yellow over a couple of weeks and needs nothing more than watching.
A small haematoma
A firm, slightly tender lump under a bruised area that is not getting bigger. It usually softens and shrinks slowly as the body clears the blood.
What helps
- Resting the area
- Avoiding lifting and straining
A large or growing haematoma
A swelling that is getting bigger hour by hour, feels tense and painful, or stretches the wound edges. This needs to be seen the same day.
An infected haematoma
Pooled blood can become infected, often a week or more later. The skin turns red and hot, pain returns, and you may feel feverish.
Call the team the same day if this happens.Causes
Why does blood collect under a wound?
Surgeons seal the vessels they cut, but small ones can start oozing again once blood pressure rises and you begin to move. Usually this stops on its own. Sometimes enough blood pools to form a lump.
Blood thinners
Medicines that thin the blood raise the chance of a haematoma. These include aspirin (Ecosprin), clopidogrel (Clopitab), warfarin, apixaban, rivaroxaban and the heparin injections given to prevent clots after surgery. Your surgeon, anaesthetist and the doctor who prescribes them decide when to pause and restart them. Never stop or restart one on your own, because the clot risk can be more dangerous than the bleeding.
Other things that add to the risk
High blood pressure, coughing or vomiting hard, straining on the toilet, a low platelet count from chemotherapy or a blood condition, and some herbal products all make bleeding more likely. Tell the team about every tablet and tonic you take.
Who needs to be most careful
People on blood thinners, and anyone who had surgery on the neck, the breast or where a large flap of skin was lifted, should look at the wound more often in the first days. If you are caring for someone at home, it helps to know which blood thinners they take and to keep that list with the discharge summary.
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Treatment
What happens once the team sees it?
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Examining the swelling
The doctor checks the size, how tense it is, and whether it is still growing. Your blood pressure and pulse are taken. A blood test may check your haemoglobin and clotting.
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An ultrasound, if needed
This shows how much blood has collected and whether it is still liquid or has already clotted.
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Watching a small one
A small, stable haematoma is usually left to clear by itself. You will be told what to watch for, and when to come back.
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Draining a larger one
A liquid collection may be drained with a needle. A clotted or large one may need a few stitches opened in the clinic.
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Back to theatre, sometimes
If it is growing fast, pressing on the airway after neck surgery, or still bleeding, the surgeon may take you back to theatre to remove the blood and seal the bleeding vessel.
On your notes
Which words might you see on your notes?
- Haematoma
- A collection of blood that has pooled under the skin or deeper tissue.
- Evacuation
- A procedure to remove the collected blood, usually in theatre.
- Aspiration
- Drawing liquid out through a needle.
- Anticoagulant
- A blood-thinning medicine that slows clotting, such as warfarin or heparin.
- Platelets
- Tiny blood cells that help blood clot. A low count makes bleeding more likely.
- Organised haematoma
- Older blood that has turned into a firm clot and is slowly being cleared by the body.
Commonly believed
What do families often believe about a haematoma?
"He is bleeding, so we stopped his blood thinner at home."
Stopping a blood thinner without advice can cause a clot in the legs, lungs, heart or brain. Call the team first. They will weigh the bleeding against the clot risk and decide.
"A hot compress will dissolve the blood."
Heat on a fresh haematoma can make the vessels open up and bleed more. Do not apply heat, oils or pastes unless the team suggests something.
"The dark lump is a tumour growing back."
A dark, bruised swelling near a fresh wound is almost always blood from the surgery. The team can confirm this by examining it. Show it to them rather than worrying alone.
"If it is not painful, it can be ignored."
Some large haematomas are not very painful, especially where the skin is numb after surgery. Size and growth matter more than pain. Show any new swelling to the team.
Questions we are asked
Common questions about haematoma after surgery
How long does a haematoma take to go away?
A small one usually softens and shrinks over a few weeks. The bruising changes colour as it clears, from purple to green to yellow. A larger one can leave a firm lump for longer. If it is getting bigger instead of smaller, call the team rather than waiting.
Can I put ice on it?
Ask your team first. Some surgeons suggest a cold pack wrapped in a cloth for short spells in the first days. Never put ice straight on the skin, and be careful where the skin is numb, because you may not feel it getting too cold. Do not use heat on a fresh haematoma.
Should my mother stop her aspirin because of the bruising?
Not on her own. Aspirin is often prescribed to protect the heart or brain, and stopping it suddenly can be dangerous. Call the surgical team and tell them she is on it. They will speak to the doctor who prescribed it and decide together what to do.
Will I need another operation?
Most haematomas do not need one. Small ones clear by themselves and some are drained with a needle. A large, growing or bleeding haematoma, or one pressing on the airway after neck surgery, may need a return to theatre. The surgeon will explain why if that is recommended.
The skin below the wound has turned purple. Is the bleeding spreading?
Usually not. Old blood moves downwards under the skin with gravity as it clears, so bruising often appears lower down after a few days. That is expected. What matters is whether the lump itself is getting bigger or tighter. If it is, call the team.
Does a haematoma affect my cancer treatment?
It does not change what was removed or the pathology result. A large one can delay the next treatment until the area heals, especially radiotherapy. Your oncologist and surgeon will agree the timing between them.
Can a haematoma get infected?
Yes, pooled blood can become infected, sometimes a week or more after surgery. Watch for the skin over it turning red and hot, pain coming back, cloudy fluid or fever. If you notice these, call the team the same day.
Will it leave a permanent lump or mark?
Most clear completely. A large haematoma can leave a firm patch under the skin for months, and occasionally some brown staining of the skin. These usually improve slowly with time. Mention it at follow-up if it is not getting better.
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Dr. C. Raghavendra Reddy
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Sources
- NHS — Bruises
- NHS — Anticoagulant medicines
- Cancer Research UK — Surgery for cancer
- Macmillan Cancer Support — Surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Fluid Collection Under the Wound (Seroma)A swelling of clear fluid instead of bloodMedicines Around Cancer SurgeryHow blood thinners are handled before and after an operationSigns Your Wound Is InfectedWhen a swelling turns red, hot and painfulComplications and Red FlagsOther signs after surgery that need a doctor
Talk to us
Worried about a swelling at home?
Call the helpline with the discharge summary and your medicine list. We will help you reach the surgical team and decide how soon it needs to be seen. One helpline serves every CION centre.