A round, itchy patch appears on your arm or leg, and the first thing you do is search for it. Half the results say ringworm, the other half say eczema, and the photos all look a bit like yours. It's a fair worry, because the two really can look alike, yet they are different problems with different treatments. Here's how discoid eczema and ringworm compare, why they get mixed up, and why it's worth getting the right answer before you reach for a cream.
Why These Two Get Mixed Up
Discoid eczema, also called nummular eczema from the Latin for coin-shaped, causes round or oval patches of inflamed skin. The NHS notes that as a patch clears, the centre can fade and leave a ring of discoloured skin, and that this ring can be mistaken for ringworm. The British Association of Dermatologists says the same, that it is common for discoid eczema to be mistaken for ringworm, and Eczema UK points out that ringworm and psoriasis can look similar to it too. A ring shape alone doesn't settle which one you have.
What Discoid Eczema Looks Like
The NHS describes discoid eczema as a long-term skin condition that causes itchy, swollen and cracked skin in circular or oval patches. It usually begins as a cluster of small spots or bumps that join up into patches ranging from a few millimetres to several centimetres wide. On lighter skin the patches look pink or red, while on darker skin they can look dark brown or paler than the surrounding skin.
Early patches are often swollen, blistered and oozing, and very itchy, particularly at night. Later they can turn dry, crusty, cracked and flaky. Most people have several patches, and the skin between them is often dry. They usually appear on the limbs, and Eczema UK lists the lower legs, trunk and forearms, although the hands can be affected too. The NHS says it does not usually affect the face or scalp. The cause isn't fully known, but it may be linked to very dry skin, minor skin injuries such as insect bites or burns, and irritants in soaps and toiletries.
What Ringworm Looks Like
Ringworm is a common fungal infection, and the NHS is clear that it is not caused by worms. The rash can look red or darker than the surrounding skin and may be scaly, dry, swollen or itchy. It is usually ring-shaped, with a red outer ring around a paler inner circle, though it can look different on the face, neck or scalp, where it may cause patchy hair loss. The NHS also notes the colour of the rash may be less noticeable on brown and black skin, and that a ringworm rash can grow, spread or appear in more than one place.
Unlike eczema, ringworm is something you catch. The NHS says it spreads through close contact with an infected person or animal, and through objects such as bedsheets, combs and towels. If you've been in close contact with a pet that has patches of missing fur, mention that to your pharmacist or GP.
Discoid Eczema vs Ringworm: Side by Side
| Feature | Discoid eczema | Ringworm |
|---|---|---|
| What it is | A long-term form of eczema; cause unknown | A fungal infection, caught from people, animals or objects |
| Shape | Round or oval patches that start as clusters of small spots or bumps | Usually ring-shaped, with a red outer ring and a paler centre |
| Surface | Early on swollen, blistered and oozing; later dry, crusty and flaky | Scaly, dry or swollen |
| Itch | Often very itchy, especially at night | May be itchy |
| Where | Usually limbs and trunk; not usually the face or scalp | Anywhere, including the scalp and groin |
| How it behaves | Can last weeks, months or years and often returns in the same area | Treated with an antifungal, often daily for up to 4 weeks |
| First step | Pharmacist or GP | Pharmacist, who can recommend an antifungal and advise if you need a GP |
How Is It Actually Confirmed?
The British Association of Dermatologists says discoid eczema is usually diagnosed from its typical round or oval look. When something else needs ruling out, a doctor may take skin scrapings to check for a fungus, swabs to check for bacterial infection, or arrange patch tests or a skin biopsy. The NHS adds that a GP can usually diagnose it by examining the skin, may arrange tests to rule out other conditions, and may refer you to a dermatologist if the diagnosis is unclear. For psoriasis, the Primary Care Dermatology Society notes that discoid patches tend to be a lighter red with a border that fades gradually, and may crust or ooze rather than scale. If psoriasis is on your mind, our guide to eczema vs psoriasis goes through that comparison.
Why Getting It Right Matters
The treatments are different. The NHS says discoid eczema is typically managed with emollients to prevent dryness, topical corticosteroids for more severe symptoms, antihistamines for the itch and an antibiotic if it becomes infected. Ringworm, by contrast, is treated with an antifungal, which the NHS says you may need to use daily for up to 4 weeks, continuing for the full time even after the rash clears. A treatment that suits one doesn't suit the other, so working out which you have saves you weeks of waiting for the wrong thing to work.
What Tends to Help Day to Day
Whichever it turns out to be, these are the points the published guidance returns to:
- See a pharmacist or GP for a proper look, as the NHS advises, rather than trying creams to find out
- If it could be ringworm, avoid sharing towels, combs and bedsheets, wash towels and bedsheets regularly, and avoid scratching, which the NHS says can spread it to other parts of the body
- For discoid eczema, keep skin moisturised with an emollient, as the NHS and Eczema UK advise, and use it in place of soap
- Avoid soaps, detergents, bubble baths and shower gels, which can irritate dry skin
- Wear waterproof gloves for cleaning products and bathe in lukewarm water, as Eczema UK suggests, because hot water can aggravate it
- Keep moisturising skin that isn't affected, and carry on after the patches clear, as the British Association of Dermatologists recommends
Frequently Asked Questions
Why does my round patch have a clear or paler centre?
Both conditions can do this. The NHS says the centre of a discoid eczema patch can clear, leaving a ring of discoloured skin, and that ringworm typically shows a red outer ring around a paler inner circle. Because they can look so alike, a pharmacist or GP is the best way to tell them apart.
Should I try an antifungal cream just in case?
The NHS advises speaking to a pharmacist first if you think you have ringworm. They can examine the rash and recommend the right antifungal, and tell you whether to see a GP. If the rash turns out to be discoid eczema, an antifungal is the wrong treatment, so a quick pharmacist visit is the safer route than guessing.
Can I catch ringworm from a pet?
Yes. The NHS says ringworm spreads through close contact with an infected person or animal. If your pet has patches of missing fur, it advises taking them to the vet, and washing your hands after handling animals or soil.
Can a child with ringworm go to school?
According to the NHS, children can go to school or nursery once treatment has started, and teachers should be told. It also advises not sharing towels, combs or bedsheets with someone who has ringworm.
How long does discoid eczema last, and will it leave marks?
The NHS says that without treatment it can last for weeks, months or years, and it often returns in the same area. The British Association of Dermatologists says treatment controls it but doesn't cure it, and that stopping treatment too soon makes a return more likely. Eczema UK says skin usually looks normal again after a flare and scarring is very rare, although on darker skin, marks can linger for months.
Who gets discoid eczema, and does it run in families?
It can start at any age but is seen more often in adults, and slightly more often in men, according to the British Association of Dermatologists. The NHS says that, unlike atopic eczema, it doesn't seem to run in families. It doesn't usually affect the face or scalp, so a round patch there is worth showing a GP.
The Bottom Line
A round, itchy patch isn't always ringworm, and it isn't always eczema either. Discoid eczema and ringworm share a ring-like look, but one is a long-term skin condition and the other is a fungal infection, and they need different treatment. Rather than guessing from photos, have a pharmacist or GP take a look, particularly if the patch is spreading, isn't improving, or is on your face or scalp. Once you know which it is, you can get on with the right plan.
Sources
- NHS, "Discoid eczema"
- NHS, "Ringworm"
- British Association of Dermatologists, "Discoid eczema" patient information
- Eczema UK, "Discoid eczema"
- Primary Care Dermatology Society, "Eczema: discoid (syn. nummular) eczema"
Ashleigh is not a medical professional and this article is not medical advice. It reflects personal and customer experience alongside published NHS and dermatology guidance. Ashleigh's Organics Body Butter is a cosmetic product, not a medicine, and is not intended to diagnose, treat, cure or prevent discoid eczema, ringworm or any other medical condition. If you have a rash you are unsure about, please follow the advice of your pharmacist, GP, dermatologist or health visitor.