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CION Cancer Clinics
Why the perineal wound heals slowly after APR, and when slow becomes stuck | CION Cancer Clinics
The perineal wound heals slowly after an APR because the area has usually had radiotherapy, because a deep hollow is left where the rectum was, and because you sit on it. A wound still weeping or partly open after many weeks is common, and in most people it is slow rather than failing. This page explains the reasons, how to tell slow from stuck, and what your team does when it stalls. 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
- Why is the perineal wound not healing after APR?
- What makes this wound different from every other wound?
- What does the team do when it is not healing?
- Slow but healing, or stuck and needing a review?
- Four things families tell us, and what is actually true
- What can you do, and what can this page not tell you?
- Common questions about a slow perineal wound
The short answer
Why is the perineal wound not healing after APR?
The perineal wound heals slowly after an APR because the area has usually had radiotherapy, because a deep space is left behind where the rectum was, and because you sit on it. A wound that is still weeping or partly open after many weeks is common, and in most people it is slow rather than failing.
What "slow" means here
The wound on the belly closes in a couple of weeks. The perineal wound is a different kind of wound. The skin may look closed on the surface while a space underneath is still filling in, or the skin may have opened in one spot and be healing upward from the base. Either way the body is doing the work, just at a pace that feels wrong to anyone watching it every day.
Slow is not the same as stuck
A slow wound gets a little smaller each week, discharges a little less, and hurts a little less. A stuck wound stays the same size for weeks, or gets bigger, or starts to discharge more. The sections below explain the reasons, what your team does when it stalls, and how to tell the two apart at home.
A slow perineal wound is not a sign that the cancer has come back. The wound and the cancer are separate questions.The reasons
What makes this wound different from every other wound?
Radiotherapy before surgery
Most people who have an APR had radiotherapy to the pelvis first. Radiotherapy leaves the skin and the tissue beneath it with a poorer blood supply for good, and healing runs on blood supply. This is the single biggest reason.
The empty space
Removing the rectum leaves a hollow in the pelvis that has to fill with new tissue from the bottom up. Fluid collects in it, and the skin above it has nothing firm to rest on. If the pelvic floor muscles were also removed, the hollow is deeper still.
Where it sits
The wound lies between the buttocks, in a warm, moist fold that is hard to keep dry, close to the urine stream and the skin bacteria of the groin. It is also exactly where your weight rests when you sit, so it is pressed and stretched many times a day.
Things about you
Diabetes, smoking, being underweight or short of protein, steroid tablets, and a low haemoglobin all slow healing anywhere in the body. Here they add to a wound that was already going to be slow.
Worth telling the team about
- Sugar readings running high
- Any tobacco, including gutka
- Weight loss since surgery
Not sure whether this applies to you?
Ask an oncologistAt the clinic
What does the team do when it is not healing?
Look and measure
The wound is examined, its size noted and often photographed, so that next time there is something to compare against. A swab may be taken if infection is suspected.
Look underneath
If fluid keeps draining, a scan may be arranged to see whether a pocket has collected in the space where the rectum was. A pocket that keeps refilling is a common reason a wound will not close.
Clean, open or pack
A pocket may be drained. Dead or unhealthy tissue is trimmed away. A wound that has opened is packed or dressed so that it fills from the base rather than sealing over a hollow. Sometimes a vacuum dressing is used to draw the edges together.
Reconsider the closure
If months pass with no progress, the surgeon may discuss moving a flap of muscle and skin into the area to bring in tissue with a fresh blood supply. This is a second operation and is not needed for most people.
!
The one thing that cannot wait
A fever together with a foul-smelling, thick or fast-increasing discharge, spreading redness, or the wound opening with bleeding, needs to be seen the same day. Ring the number on your discharge sheet or go to the nearest emergency department and say you have had rectal cancer surgery. Do not wait for the next clinic date, and do not start antibiotics from a pharmacy on your own.
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Telling them apart
Slow but healing, or stuck and needing a review?
Slow but healing
Stuck, ask for a review
Wound is a little smaller each week
Same size for several weeks, or getting bigger
Clear, pink or thin yellow fluid, slowly reducing
Thick, green, brown or foul-smelling discharge, or more of it
Pain easing week on week
Pain getting worse, or a new throbbing ache
Red, bumpy new tissue at the base
Grey, black or slimy tissue, or a deepening hole
Feeling generally well
Fever, chills, or feeling unwell with any wound change
Commonly believed
Four things families tell us, and what is actually true
"If it is not healing, the cancer must still be there."
Slow healing here is caused by radiotherapy, the hollow left behind and the position of the wound. It is not a sign of cancer. Whether any cancer remains is answered by the pathology report and the follow-up scans, not by the wound.
"A course of antibiotics will speed it up."
Antibiotics treat infection. They do nothing for a wound that is slow because of poor blood supply, and taking them without a reason breeds resistant germs. If infection is suspected, the team will swab the wound and choose the right one.
"The surgeon must have made a mistake."
Perineal wound problems after an APR are common even in skilled hands, and more so after radiotherapy. Surgeons expect them and plan for them, which is why some close the wound with a flap from the start.
"Putting turmeric or ghee on it will help it close."
Home pastes trap moisture and bacteria in a deep wound and make it harder for the team to see what is happening. Clean water and the dressing you were given are enough. If you want to try something, ask first.
Being straight with you
What can you do, and what can this page not tell you?
You cannot undo the radiotherapy or fill the hollow yourself. What you can do is remove the things that slow healing further, and make sure the team sees the wound often enough to catch a stall early.
Things that are in your hands
Eat protein at every meal: dal, eggs, milk, curd, paneer, fish or chicken. Keep blood sugar steady if you have diabetes, and tell the doctor if readings are high rather than adjusting anything yourself. Stop all tobacco, and ask the team for help doing it. Walk several times a day. Lie on your side rather than sitting for long spells. Rinse the wound with clean water daily and keep it dry between rinses.
What this page cannot tell you
It cannot tell you how long your wound will take, whether it will need a flap, or whether what you are seeing today is infection. Those questions need someone to look at the wound. A photograph sent to your team between visits is often enough.
If the wound has stopped changing for a few weeks, ask for a review even if nothing else has changed. Waiting for the next scheduled visit rarely helps a stuck wound.Questions we are asked
Common questions about a slow perineal wound
It has been months and the wound is still open. Is that normal?
It is common, especially after radiotherapy or an operation that took the pelvic floor muscles. What matters is the direction: a wound that is slowly getting smaller is healing. A wound that has not changed in several weeks needs a review, because there may be a pocket of fluid underneath that is stopping it.
Why did the radiotherapy make such a difference?
Radiotherapy damages the small blood vessels in the treated area, and that damage does not recover. Healing depends on blood bringing oxygen and building material to the wound, so less blood means slower building. The radiotherapy was given because it lowers the chance of the cancer returning.
What is a perineal sinus?
A narrow track from the skin down into the space where the rectum was. It keeps draining a little fluid and the opening never quite seals. It is treated by finding out why it is draining, often a pocket underneath, and dealing with that. A sinus that persists is one reason a flap is discussed.
Will I need another operation?
Most people do not. Dressings, packing, draining a pocket and time settle the majority. A second operation, usually to move in a flap of muscle and skin, is discussed when months have passed without progress. Your surgeon will explain the reasons if it comes to that.
Does a vacuum dressing hurt?
A negative-pressure dressing is a sealed foam pad connected to a small pump that gently draws fluid away and pulls the wound edges together. Most people feel a tugging when it starts and little afterwards. Changing it can be uncomfortable, and the team will give pain relief beforehand if needed.
Can my mother travel back to the village with an open wound?
Often yes, if someone at home can do the dressing and there is a nurse or doctor nearby to look at it. Ask the team to write down exactly what to do, how often, and what changes should bring her back. Long bus journeys on the wound are the hard part; lying across a seat is easier than sitting.
Should I take protein powder or supplements?
Food protein comes first: dal, eggs, milk, curd, paneer, fish or chicken at every meal. If appetite is poor or weight is dropping, ask the team or a dietitian about a supplement rather than buying one from a shop. Some products are unsuitable for people with diabetes or kidney problems.
Is the slow wound delaying my chemotherapy?
Sometimes. Some chemotherapy slows healing, so the oncologist may wait for the wound to settle before starting, or start and watch the wound closely. This is a judgement your medical and surgical teams make together. Ask them directly how the wound is affecting the plan.
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Sources
- Cancer Research UK — Surgery for bowel cancer
- NHS — Bowel cancer: treatment
- American Cancer Society — Surgery for rectal cancer
- National Cancer Institute — Rectal cancer treatment (PDQ), patient version
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
The Perineal Wound After APRWhat the usual course looks like and how to care for itFlap Closure of the Perineal WoundThe second operation discussed when a wound will not closeExtralevator APR ExplainedThe wider operation that leaves a deeper hollowComplications and Red FlagsOther changes after surgery that need a same-day callRecovery, Eating and Getting Back to LifeProtein, weight and strength while a wound heals
Talk to us
Not sure whether the wound is slow or stuck?
Send us a photograph and your discharge summary, or call the helpline. A surgical oncologist will tell you whether it needs to be seen and how soon. One helpline serves every CION centre.