Ringworm vs Eczema: How to Tell the Difference

A red, itchy, scaly patch could be a fungal infection or it could be eczema - and the two are managed very differently. As a grappler I've seen both, sometimes on the same person. Here's how they differ and, just as importantly, why you shouldn't bet your skin on a guess. This is general information only, not medical advice, and it's not about any product we sell. Telling these apart is exactly the sort of call the dermatologists we work with, like Dr Samujjala Deb Chatterjee, are trained to make - and the honest answer is that it's often not obvious by eye.

Two genuinely different things

Ringworm (doctors call it tinea corporis) is a fungal infection caused by dermatophytes - the same broad family behind athlete's foot and jock itch (NHS: Ringworm). Eczema, most often atopic dermatitis, is not an infection at all: it's an inflammatory skin condition linked to a sensitive, easily-irritated skin barrier (NHS: Atopic eczema). One is something you catch; the other is something your skin does. That difference is why getting the label right actually matters.

Clues people use (with caution)

• Shape and edge: ringworm classically forms a roughly circular patch with a raised, scaly edge and a clearer centre. Eczema tends to be less defined, often appearing in patches or in the skin creases.
• Pattern over time: eczema frequently recurs in the same places and may be long-standing; a new, single patch that's slowly expanding outward is more suggestive of ringworm.
• Personal history: a known tendency to dry, sensitive, flaring skin - or childhood eczema, asthma or hay fever - points more towards eczema.
• Itch: both can be itchy, so itch alone tells you very little.

These are general tendencies, not a diagnostic test. Plenty of real cases cheerfully break the "rules," which is the whole problem with eyeballing it.

Why guessing backfires

Here's the practical catch: the things that help one can do nothing for, or even aggravate, the other. Treat a fungal infection as though it were eczema - or the reverse - and at best you waste time while it carries on, and at worst you irritate the skin further. A spreading, untreated fungal infection also has more chances to pass to your training partners. That's the core reason this is a clinician's call rather than a gym-floor diagnosis.

A third possibility: irritation from training

Not every patch is ringworm or eczema. If the irritation seems tied to the mats, sweat, or the chemicals used to clean the mats rather than to an infection or a long-standing tendency, you may be looking at contact dermatitis - covered in contact dermatitis from mats. It's another reminder that "red and itchy" has several possible causes that look alike.

Why a steroid cream on a fungal patch causes so much trouble

This is the single most useful thing to understand about getting the two mixed up, and it explains why clinicians are so insistent about not guessing.

Topical steroid creams reduce inflammation. On eczema, that is the point. On a fungal infection, reducing the inflammation calms the redness and itch for a few days while doing nothing about the fungus underneath, which carries on spreading. The result is a patch that looks better, then returns looking different: less defined, less obviously ring-shaped, and harder for anyone to recognise. Dermatologists have a name for this altered appearance, tinea incognito, precisely because it turns up often enough to need one.

Two practical consequences. First, "it improved on the cream I had in the cupboard" is not evidence that a patch was eczema. Second, if you have already used a steroid cream on something before seeing anyone, say so. It genuinely changes what the clinician is looking at, and it is useful information rather than something to be embarrassed about.

What a clinician does that you cannot do at home

It is reasonable to wonder what a pharmacist or GP has that a careful look in the mirror does not. Several things.

• Pattern recognition across many cases, including all the ones that do not look like the textbook photograph, which is most of them.
• Your history, which often settles it: childhood eczema, asthma or hay fever pulls one way; a training partner with a recent similar patch pulls the other.
• Simple tests where needed. A skin scraping examined under a microscope or sent for culture can confirm a fungal infection, which is the kind of answer no visual comparison provides.
• The wider picture. Where else is it, how has it changed, what have you already tried, and does anything about it suggest a third possibility entirely.

None of that requires an appointment weeks away. A UK pharmacist can look at a patch, ask the right questions and tell you whether it is a self-manage situation or a GP one, usually in a few minutes and without an appointment.

Other things that look like both

Red, itchy and scaly is a description shared by a long list of conditions, which is exactly why eyeballing it is unreliable. Beyond ringworm and eczema, a patch on an athlete might be:

• Psoriasis, which can form well-defined patches with silvery scale and often appears on elbows, knees or the scalp.
• Contact dermatitis, irritation from something the skin has touched, such as mat cleaning residue, a new detergent or a piece of kit. It maps to the contact area rather than spreading outward on its own, and it is covered in contact dermatitis from mats.
• Pityriasis versicolor, another fungal condition that shows as patches of altered colour, often on the trunk and often more noticeable after sun exposure.
• Friction and heat rash from gear, which follows where kit rubs and settles with rest.
• The early stage of something bacterial, which is why anything getting hotter, more swollen or more painful gets seen promptly rather than watched.

The list is not here to alarm anyone. It is here to make the point that "it looks like ringworm" is a starting hypothesis, not a conclusion, and that the cost of confirming it is a short conversation with a pharmacist.

What to do while you are waiting to find out

You do not have to sit in limbo doing nothing. Until a patch is identified, the sensible defaults are the same regardless of which it turns out to be. Keep the area clean and dry with whatever gentle wash you normally use, and resist introducing anything new. Do not scratch it, however tempting. Cover it if you must be around others, while remembering that covering is a courtesy rather than a guarantee. Do not start a treatment on a hunch, since that is the exact move that causes the problem described above. And take a photo when you first notice it, because a clear before-and-after over a few days is genuinely useful information for whoever assesses it.

On the training question, the cautious default is the right one. If there is any chance it is fungal, it can pass to your partners, so skin contact waits until you know. The etiquette side is covered in when to stay off the mats.

Looking after your skin either way

Whatever the cause turns out to be, a healthy skin barrier helps with both resilience and irritation - there's more in skin barrier basics for athletes. And if it does turn out to be ringworm, our guide to spotting ringworm in BJJ covers the hygiene side and how to avoid sharing it around the room.

Common questions

Can I just use an anti-itch cream and see what happens?

It's tempting, but it's exactly the guesswork this article warns against: something that soothes one cause can do nothing for, or even worsen, the other, and you may simply delay sorting out what's actually going on. A pharmacist can point you in the right direction quickly and cheaply, which beats trial and error on your own skin.

Why can't I tell them apart from photos online?

Because real cases rarely look like the textbook image, lighting and skin tone change the picture, and several different conditions share the same "red, itchy, scaly" description. Even clinicians sometimes use tests rather than rely on appearance alone - which is the whole reason eyeballing it isn't reliable.

Does it matter which one it is if it's mild?

Yes, because the right approach depends entirely on the cause, and a fungal infection left unmanaged can also spread to training partners. "Mild" is a good reason to sort it early while it's easy, not a reason to ignore it. The earlier the right call is made, the less hassle either condition tends to be.

Should I stop training until I know what it is?

If there's any chance it's a fungal infection rather than eczema, it's worth being cautious around training partners until it's confirmed, since infections can spread. Getting a quick answer from a pharmacist or GP is the fastest way to know whether you can carry on as normal or need to sit out for a bit.

When to see a doctor

See a pharmacist or GP for any new, spreading or persistent rash, anything you can't confidently identify, or skin that isn't responding to whatever you've already tried. A pharmacist is a good first stop in the UK and can tell you whether you can manage something minor yourself or need a GP. Getting the diagnosis right is the entire point of this article.

This article is general educational information and not medical advice, and it isn't about any Combat Sports Hygiene product. If you're worried about your skin, contact a GP, pharmacist or dermatologist.