Why some wounds get stuck: the biofilm problem

Most cuts follow a schedule. A graze scabs over in a day or two, itches for a while, and a week later you have forgotten which knee it was on. That is healing doing exactly what it should.

Then there is the other kind. The sore on a diabetic foot that looks much the same in March as it did in January. The ulcer on an elderly parent's lower leg that scabs, weeps, half-closes and opens again. The pressure sore that will not turn the corner no matter how carefully it is dressed. If you are caring for a wound like that, or living with one, the slow grind of it wears you down, and it is easy to assume you must be doing something wrong.

Usually you are not. A wound that stalls is rarely about effort or care. More often something physical is getting in the way, and it has a name.

What "stuck" actually means

Healing normally moves through a few overlapping stages. First the bleeding stops. Then comes a burst of inflammation, the redness and swelling that clears out debris and germs. After that the wound starts rebuilding - new tissue, new blood vessels, the edges drawing in - and finally the fresh skin remodels and strengthens over the following weeks and months.

A stuck wound is one that never gets past that second stage. It sits in inflammation, week after week, not closing and not really trying to. The usual marker is time - a wound that has not meaningfully improved in about four to six weeks is generally considered chronic, or hard-to-heal. It is a common problem, and a particular one for certain groups. Diabetic foot ulcers, venous leg ulcers and pressure sores are the classic hard-to-heal wounds, which is why this tends to land hardest on older people and the families and carers looking after them.

The hidden troublemaker: biofilm

So what is holding it in that stage? A lot of the time, the answer is biofilm.

Biofilm is what bacteria build when they settle in and get organised. Rather than drifting about as single cells, they gather on the wound surface and wrap themselves in a self-made layer of slime - a physical shield that glues them down and seals them off. It is less a smear of germs and more a fortress.

That fortress is the problem. Bacteria inside a biofilm can be up to a thousand times more tolerant of antibiotics than the same bacteria floating free, which is why a course of antibiotics can leave a wound looking barely changed. The slime also hides the bacteria from the immune system, so the body keeps sensing a threat it cannot quite reach - and keeps the inflammation running. That is the trap. The biofilm keeps the wound inflamed, and inflammation is exactly the stage the wound cannot get past. Round it goes.

Biofilm is not some rare complication either. It is thought to be present in a large share of chronic wounds - by some estimates well over half. For a wound that has genuinely stalled, it is one of the first things worth suspecting.

Why the usual instincts don't shift it

Here is where good intentions can quietly work against you, because the instinctive things often do not touch a biofilm, and a few make it worse.

Reaching for soap to clean a wound is a common one, but soap and other alkaline cleansers can interfere with healing and with some of the treatments used on the wound. Salt water gets recommended a lot, and it is gentler than its reputation suggests, but it does not break a biofilm apart. Strong antiseptic creams and harsh disinfectants can damage the fragile new tissue you are trying to grow while leaving the shielded bacteria underneath largely untouched. Petroleum jelly and waterproof dressings seal the wound off in a way that can trap moisture and bacteria rather than help. None of this is obvious, and none of it is a failing on the carer's part. It is simply that a biofilm does not respond to being dabbed at. It has to be physically destroyed.

This infographic explains how biofilm can stall wound healing. It outlines the self-perpetuating cycle that keeps chronic wounds from improving.

What actually helps a stuck wound move

Which is the key to the whole thing - you have to break the fortress open, not just wash over it.

The single most important step is debridement, the clinical word for physically removing the dead tissue and the biofilm sitting on the wound bed. It matters more than almost anything else, and wounds that are debrided regularly heal far more reliably than wounds cleaned only now and then. That can be done in a clinic, and for chronic wounds there is also a gentler at-home version - a wet-to-moist woven gauze technique that lifts debris away each time the dressing is changed.

Around that, the ordinary principles hold. Keep the wound clean with plain water rather than soap or salt water. Keep it moist but breathable, not sealed under something waterproof. For a leg ulcer, compression is genuinely important and worth getting properly fitted. And treat the thing underneath - blood sugar for a diabetic ulcer, pressure relief for a bed sore - because a wound will keep stalling as long as its cause is still in play.

The honest part is that a truly chronic wound is not really a solo home project. If a wound has not clearly improved in a few weeks, that is the moment to bring in a doctor or a wound-care nurse, not to push on alone. The best results come when the home care and the professional care pull in the same direction.

Where Trifectiv Wound & Burn Care fits

This is where Trifectiv Plus Wound & Burn Care earns its place, and it helps to be clear about what it does. The active ingredient is premium-grade hypochlorous acid, or HOCl - the same molecule your own white blood cells make to fight infection. It works in two directions at once. It kills a broad range of bacteria, viruses and fungi on contact, including the drug-resistant strains that antibiotics struggle with, and it helps break down the biofilm that shields them. At the same time it calms the four signs of inflammation - the redness, heat, swelling and pain - which frees the body to get on with repair rather than firefighting.

It is gentle enough for the whole family, safe for babies and during pregnancy, and it does not sting, which matters when the person you are treating is a frightened child or a tender elderly leg. It is a registered medical device here in South Africa. It is best used with the wet-to-moist gauze method for pretty much any wound that can be dressed, so the chemical and the physical work happen together.

What it is not is a fix on its own. It sits alongside the debridement, the compression, the managing of the underlying cause - a good tool in the kit rather than the whole kit. Stuck wounds respond to a few sensible things done together, not one thing done hopefully.

The same troublemaker, elsewhere

It is worth knowing that biofilm is not only a wound problem. The same slime-shield trick sits behind a lot of stubborn infection elsewhere in the body. It is a major reason chest infections in conditions like cystic fibrosis and bronchiectasis are so hard to clear, and why some sinus trouble keeps returning however many times it is treated. The bacteria dig in behind the same defences.

The science on tackling biofilm in the airways is younger and still being worked out - early safety studies on inhaled HOCl are encouraging. The thread worth holding onto is simply that many infections that will not shift are shielded in the same way, and getting past the shield is usually the whole game.

From stuck to moving

If you are looking after a wound that will not close, the most useful thing to take from all this is that it is probably not your fault, and probably not a matter of trying harder at the same things. A stalled wound is usually a biofilm problem, and biofilm asks for a change of approach - breaking it up, calming the inflammation, treating the cause underneath, and bringing in professional help sooner rather than later.

That is the shift, really. From doing more to doing differently. From panic to protocol. A wound that has been stuck for months can still turn the corner, once the thing holding it back is dealt with properly.