5 Things You Probably Believe About Eczema That Aren't True
If you have eczema, chances are someone has told you it's "just dry skin," that cortisone is the only real fix, or that natural remedies are nice but not backed by science. None of those three are fully true. Research from Harvard Medical School has linked eczema flares to a specific bacterium living on the skin, and separate peer-reviewed studies have found that natural crocodile oil has measurable antibacterial activity against that exact bacterium. Below, we go through five of the most common eczema myths and what the actual research says.
In this article
- Myth 1: Eczema is just dry skin
- Myth 2: Cortisone is the only real fix
- Myth 3: Natural oils are folk remedy, not real science
- Myth 4: You'll always need stronger steroids over time
- Myth 5: If a cream doesn't sting, it isn't working
- FAQ
Myth 1: Eczema is just dry skin
The truth: dryness is part of the picture, but it isn't the whole story. In a study published in the journal Cell, immunologists at Harvard Medical School's Blavatnik Institute, led by Dr Isaac Chiu, found that the bacterium Staphylococcus aureus ("staph") is present on more than 90% of itchy, inflamed eczema patches. More surprising still, the researchers found staph doesn't just sit there. It releases a toxin that acts directly on nerve endings in the skin, triggering the itch sensation itself, separate from ordinary inflammation.
That helps explain why moisturising alone often isn't enough to break a flare: dry skin makes the barrier easier for staph to colonise, staph triggers itch, scratching breaks the skin further, and the cycle repeats.
Myth 2: Cortisone is the only real fix
The truth: cortisone calms inflammation, which is real and valuable during a bad flare. What it does not do is deal with the bacteria sitting on the skin and driving that inflammation in the first place. That's one reason eczema can return soon after a course of steroid cream ends: the underlying driver was never addressed, only the symptom.
This isn't an argument to stop a prescribed treatment unprompted. It's a reason to ask your dermatologist or GP whether a long-term plan should also include something that supports the skin barrier and works against the bacteria, alongside any cortisone they prescribe.
Myth 3: Natural oils are folk remedy, not real science
The truth: some natural remedies are mostly tradition. Crocodile oil isn't one of them, at least not anymore. A study published in the Journal of Ethnopharmacology tested crocodile oil in the lab and found it showed measurable, dose-dependent antimicrobial activity against Staphylococcus aureus, the same bacterium identified in the Harvard eczema research. A more recent 2025 study published in Scientific Reports found crocodile oil active against several strains of Staphylococcus aureus, including methicillin-resistant strains. The same 2012 study found crocodile oil's anti-inflammatory effect comparable to ibuprofen in laboratory testing.
To be fair to the science, these are laboratory studies of crocodile oil as an ingredient, not clinical trials on people with eczema using a specific product. But it is genuine, peer-reviewed, published research, not folklore.
| Myth | What the research actually shows |
|---|---|
| Eczema is just dry skin | Staph aureus is on 90%+ of itchy lesions and directly triggers itch (Harvard, Cell, 2023) |
| Cortisone is the only fix | Treats inflammation, not the bacterial driver behind it |
| Natural oils aren't real science | Crocodile oil shown active against staph, including MRSA, in peer-reviewed lab studies |
| You'll always need stronger steroids | Often steroid dependency (TSW), not a worsening disease |
| A cream must sting to work | Stinging usually signals irritation, not effectiveness |
Cortisone-free, fragrance-free, with natural antimicrobial peptides and vitamins E and A.
Myth 4: You'll always need stronger steroids over time
The truth: needing a stronger steroid each time isn't necessarily eczema "getting worse" on its own. It is often a sign of topical steroid withdrawal (TSW), where skin becomes dependent on cortisone and reacts badly when it's reduced. The way to interrupt that climb isn't always a stronger steroid. It's often addressing the underlying skin barrier and bacterial load so the skin needs less help from steroids to begin with, ideally under medical guidance.
Myth 5: If a cream doesn't sting, it isn't working
The truth: this is one of the more damaging myths, because it keeps people using products that actively irritate broken skin. Stinging on cracked or inflamed skin is usually a sign of alcohol, fragrance, or harsh actives in a formula, not proof of effectiveness. A fragrance-free, hypoallergenic balm can support the skin barrier and work against bacteria without ever stinging, which is one of the most common reasons people switch products in the first place.
For households managing eczema long-term. No sting, no cortisone.
Frequently asked questions
Is eczema caused by bacteria, or is the bacteria a side effect?
Both are partly true. Eczema itself is a barrier and immune condition, but Harvard's research shows Staphylococcus aureus colonises eczema-prone skin and actively worsens it by triggering itch directly, not just sitting there as a side effect.
Should I stop using cortisone because of this research?
No, not on your own. Speak to your dermatologist or GP before changing any prescribed treatment. The research is a reason to ask better questions about your long-term plan, not a reason to self-prescribe.
Is crocodile oil safe for sensitive or broken skin?
Crocodile oil is hypoallergenic and used in fragrance-free formulas like Repcillin specifically because it tends not to irritate sensitive or broken skin, unlike many alcohol- or fragrance-based creams.
How quickly does addressing the bacteria help?
This varies by person. Repcillin customers most often report softer, less itchy skin within one to two weeks of consistent, twice-daily use.
Is this the same as the Repcillin product being clinically tested?
No. The Harvard study is about the staph-eczema link generally, and the crocodile oil studies are laboratory tests of crocodile oil as an ingredient, not clinical trials of Repcillin specifically. We think that distinction is worth being upfront about.
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This article is for general informational purposes and is not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any skincare or medical treatment. Sources: Harvard Medical School / Cell (2023) on Staphylococcus aureus and atopic dermatitis itch; Journal of Ethnopharmacology (2012) and Scientific Reports (2025) on the antimicrobial and anti-inflammatory activity of crocodile oil.