Discoid Eczema

Overview

Discoid eczema (also called nummular eczema) is a common skin condition that causes round or oval patches of inflamed, itchy skin. 'Discoid' means disc-shaped, and 'nummular' means coin-shaped — both words describe how the patches look. The patches can be dry and scaly, or they can weep and crust over. Discoid eczema is not contagious, so you cannot catch it from someone else or pass it on.

Yes, it is fairly common. It is one of the more frequent types of eczema seen in general practice, especially in adults with dry skin.

It can affect anyone at any age, including children, but it is most often seen in adults. It is more common in men than women, and often starts in middle age or later. People with very dry skin, a personal or family history of eczema, asthma or hay fever, or poor circulation in the legs may be more likely to get it.

Symptoms

Common symptoms

• Round or oval patches of red, inflamed skin that look like coins or discs
• Intense itching, which can be worse at night and disturb sleep
• Dry, scaly, or cracked skin on the patches
• Weeping or oozing of clear fluid from the patches
• Crusting, which may be yellowish if the skin has become infected
• Patches that join together to form larger areas of affected skin
• Small bumps or blisters (fluid-filled spots) on the edges of the patches
• Clear, well-defined borders between the patch and normal skin

Symptoms in children

• The patches are sometimes mistaken for ringworm (a fungal skin infection) because of their round shape
• Itching can make children restless, irritable or have trouble sleeping
• Scratching can lead to infection, so watch for weeping, crusting or soreness
• It may flare up more during cold, dry weather or after frequent baths with harsh soaps

Symptoms in older adults

• Very dry, thin skin makes patches more likely and slower to heal
• It often affects the lower legs, especially where circulation is poor or legs are swollen
• Patches may become long-lasting (chronic) and come back in the same places
• Healed areas can leave darker or lighter marks on the skin that slowly fade

Causes

Main causes

• The exact cause is not fully known. It is thought to involve a problem with the skin's protective barrier, which lets moisture out and irritants in.
• Dry skin is a very common trigger — discoid eczema often starts on already dry skin, particularly in cold or dry weather.
• Irritants such as harsh soaps, bubble bath, shower gels, detergents or frequent washing can set it off.
• Minor injury to the skin, such as a scratch, insect bite or scrape, can trigger a patch in that spot.
• Some people react to metals such as nickel (found in jewellery, coins and some clothing fasteners) or to other contact allergens.
• Poor circulation or swelling in the legs can make patches on the lower legs more likely and harder to heal.

Risk factors

• Very dry or sensitive skin
• A personal or family history of eczema, asthma or hay fever
• Being middle-aged or older
• Being male (men are affected more often)
• Living in a cold, dry climate or spending time in centrally heated rooms
• Frequent bathing or showering with harsh soaps
• Swollen legs, varicose veins or poor circulation
• Stress, which can make many skin conditions flare
• Contact with metals such as nickel or other skin irritants

When to see a doctor

See a doctor urgently if:

• The patches look infected — more painful, hot, swollen, weeping pus, or covered in yellowish crusts
• You have a fever or feel unwell along with the rash
• The rash is spreading quickly or is very severe
• You have sudden swelling of the face or lips, or trouble breathing

Book a routine appointment if:

• You have round, itchy patches that have not improved after a week or two of gentle skin care with a moisturiser
• The itching is disturbing your sleep or affecting daily life
• You are not sure what the rash is and would like it checked
• The patches keep coming back in the same places
• You have patches on your legs along with swelling or varicose veins

Diagnosis

A doctor, usually your GP, can often tell what it is just by looking at your skin and asking a few questions — about when it started, what makes it worse, your general health, and any products you use on your skin. No special test is usually needed.

Tests that may be done

• A skin swab (a soft cotton bud rubbed on the skin) if the doctor thinks the patches might be infected
• A skin scraping checked under a microscope, or a small sample of skin, to rule out a fungal infection such as ringworm
• Patch testing (small amounts of common allergens taped to your back for a few days) if a contact allergy is suspected
• Blood tests are not usually needed, but may be done if another condition is suspected

What to expect at your appointment

The appointment is usually short and simple. Your doctor will look at the patches, may ask about itching and sleep, and may check your legs for swelling or circulation problems. You may be given a moisturiser and a treatment plan to try, with a review if things do not settle.

Treatment

Treatment aims to calm the inflammation, relieve itching, repair the skin's barrier and prevent infection. Most people are treated with moisturisers plus a medicated cream or ointment from their doctor, along with changes to washing and skin care habits.

Self-care at home

• Moisturise (use an emollient) generously and often — at least twice a day, and more if your skin is very dry. This is the single most important thing you can do.
• Use a soap substitute or wash with plain lukewarm water instead of soap, shower gel or bubble bath.
• Keep baths and showers short and not too hot.
• Pat your skin dry gently and apply moisturiser within a few minutes while the skin is still slightly damp.
• Wear soft, breathable fabrics such as cotton next to your skin, and avoid wool and scratchy labels.
• Keep your nails short and smooth to reduce damage from scratching. Gentle tapping or pressing on the itch can help.
• Avoid known irritants such as perfumed products, certain metals and harsh detergents.
• Use a humidifier or avoid very dry, overheated rooms if your skin feels worse in winter.
• If you think a product is causing the problem, stop using it and mention it to your doctor or pharmacist.

Medical treatments

Your doctor may prescribe an anti-inflammatory cream or ointment to reduce redness and itching — these are often steroid-based and come in different strengths depending on where on the body they are used. They are usually applied for a set period and then reduced. Your doctor may also suggest a non-steroid anti-inflammatory cream for sensitive areas such as the face. If the skin looks infected, antibiotics may be needed. For very itchy or widespread patches, other options may be discussed, such as treatments that affect the immune response, light (ultraviolet) therapy, or, in some cases, tablets for itching. Your doctor or pharmacist will explain exactly how and when to use anything prescribed, and how long to continue. Always follow their instructions and ask if anything is unclear. Never use someone else's prescription cream.

When is surgery considered?

Surgery is not a treatment for discoid eczema.

Living with this condition

Discoid eczema can be frustrating because the itch can be intense and the patches can come back. Building a simple daily routine — moisturiser in the morning and before bed, gentle washing, and soft clothing — makes a real difference over time. Keep a note of what seems to trigger flares so you can avoid it where possible.

Lifestyle tips

• Make moisturising a habit, like brushing your teeth — keep a tub in the bathroom and one by your bed.
• Choose unperfumed, gentle skincare and laundry products.
• Keep bedrooms cool and avoid overheating at night, which makes itching worse.
• Manage stress where you can — gentle exercise, breathing exercises, or talking to someone can help.
• If your legs swell, raise them when resting and mention it to your doctor.
• Avoid scratching by keeping nails short and wearing cotton gloves at night if needed.

Diet and exercise

There is no special diet that cures discoid eczema, and most people do not need to avoid foods. If you notice a specific food seems to trigger flares, talk to your doctor before cutting it out, as unnecessary restrictions can do more harm than good. Exercise is good for your general health and can help with stress. Choose comfortable, breathable clothing, shower gently afterwards and moisturise — sweat and chlorine can sometimes sting or irritate, so rinse off soon after.

Mental health and emotional wellbeing

Skin conditions are not just skin deep. Constant itching, visible patches and poor sleep can affect mood, confidence and relationships. Feeling upset or anxious about your skin is very common and completely understandable. If you feel low, anxious or overwhelmed, tell your doctor — support is available. If you ever feel you cannot cope or have thoughts of harming yourself, contact your local emergency number or a crisis support service in your area straight away.

Prevention

You cannot always prevent discoid eczema, but you can reduce how often it flares. Keeping your skin well moisturised every day, even when it looks clear, is the most effective step. Avoiding harsh soaps and known irritants, and treating dry skin early, also helps.

Screening programmes

There is no screening programme for discoid eczema. Regular self-checks of your skin, and seeing your doctor if a patch changes, spreads or does not heal, are the best approach.

Complications

If left untreated

• The skin can become infected, which may need antibiotics and can make the eczema worse
• Constant scratching can thicken and scar the skin over time
• Sleep can be badly disrupted by itching, leading to tiredness and low mood
• Healed patches may leave darker or lighter marks that can take months to fade
• The condition may become long-lasting and spread to other areas

Long-term outlook

The outlook is generally good. Most people improve with regular moisturising and treatment from their doctor, often within a few weeks. Many people have flares from time to time, especially in cold weather, but these can usually be managed with the plan you and your doctor agree on. Some people find it settles completely. With good skin care, most people are able to keep it well controlled.

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