CAP Therapy for Eczema and Dermatitis: What It May Do for Inflamed Skin

If you have eczema or dermatitis, you already know the pattern. Something settles it for a while. Then it comes back, often in the same place, often without an obvious reason.

Most advice about eczema is about what to put on it. Far less of it explains why the skin is behaving this way in the first place. That part is worth understanding, because it changes what a treatment plan should actually be trying to do.

Your skin is an ecosystem

Your skin is home to an entire community of microorganisms. That is not a hygiene problem. It is how healthy skin works. When that community is diverse and in balance, it helps hold your barrier together, keeps the pH where it should be, and quietly crowds out the things you do not want.

When the barrier is compromised, the balance shifts. Diversity drops. And one particular resident tends to take advantage.

What staph has to do with eczema

Staphylococcus aureus, usually shortened to staph, lives on most people’s skin at low levels without causing trouble. On eczema-prone skin it can overgrow substantially, and research consistently finds much higher levels of it on affected skin than on healthy skin.

Think of it as an unwanted guest moving into a house that already has a broken window. It settles in, it gets comfortable, and it makes the repairs harder to finish.

And then there is the biofilm

Bacteria on skin do not only sit there as individual cells. They can build a biofilm, a self-made protective layer that shields them from the things meant to clear them, including your own immune response and topical treatment.

This is one reason some skin stays stuck in the same loop of inflammation, itch and slow healing no matter how good the skincare is. You can be doing everything right on the surface and still be working against something that has built itself a roof.

Where CAP Therapy comes in

Cold Atmospheric Plasma Therapy takes a different route. Instead of applying something to the skin, it energises the nitrogen and oxygen already in the air to create a cool plasma, which delivers a short-lived mix of reactive oxygen and nitrogen species to the skin surface.

Those reactive species are what bacteria struggle with. Laboratory research shows cold plasma has broad antimicrobial activity across bacteria, fungi and viruses, and that it is able to disrupt biofilms, which is notoriously difficult to do. Because it works through oxidative stress rather than a single biochemical target, resistance is not thought to develop the way it does with antibiotics.

And it does all of this below 40°C. No heat, no wound, no downtime. For skin that could not tolerate a peel or a laser, that matters enormously. Here is the full explanation of how CAP Therapy works.

What the eczema research actually shows

The clearest evidence so far comes from a pilot study published in Scientific Reports in 2021. Twenty-two people with mild to moderate atopic dermatitis had CAP applied to a lesion on one side of the body, with a sham treatment on the matching lesion on the other side. Three sessions, over two weeks.

• Severity scores improved significantly on the CAP-treated side and not on the control side
• Itch scores improved significantly
• The proportion of S. aureus in the skin microbiome fell from around 23% to 10% on the treated side, while the control side stayed essentially flat
• No serious side effects were reported

It is one small study. It is a pilot. The people in it had mild to moderate eczema, not severe. We are telling you the size of it because you deserve to weigh it yourself, and because “one promising 22-person study” is a more useful thing to know than “clinically proven”.

Before

After one package

Individual results vary. Photographs show one person’s skin at two points in time and are not a prediction of anyone else’s outcome. Progress depends on your skin, your history, your treatment plan and what else is happening in your health. See all three client journeys.

Sterile is not the goal

This is the part we care most about getting across.

The point of reducing staph is not to strip your skin of everything living on it. A sterile face is not a healthy face. What we are after is the balance coming back, so that your skin’s own community can do the work it is supposed to do.

That is also why we are careful about how often we treat, and why the products that go on afterwards are chosen rather than assumed. More is not better. Better is better.

What CAP Therapy will not do

It will not cure eczema. Eczema is a chronic, relapsing condition with a genetic and immune basis, and nothing applied to the surface changes that.

It will not replace your medical care. If you are working with a GP or a dermatologist, keep doing that. Medical care and skin therapy are not in competition and we will happily plan around your prescriptions.

And it will not do much on its own. CAP works best when the rest of the picture is being supported too: barrier care that is not doing too much, sleep, nutrition, stress, and enough space between treatments for the skin to actually respond.

As the season turns

Heading into a New Zealand summer, reactive skin usually feels the change first. Heat, sweat, humidity, chlorine and salt water, more time outdoors, more friction from clothing and sunscreen. If your skin has been manageable through winter and you can feel it starting to shift, that is a good moment to get ahead of it rather than waiting until it is unbearable.

If steroid withdrawal is part of your picture, we have written about that separately and honestly here.

Common questions