Eczema and atopic dermatitis: what it is and how it is managed

If you or your child has itchy, dry, inflamed skin that keeps coming back, the word "eczema" tends to arrive quickly, and so do many questions. Is it an allergy? Will it go away? Why does it flare when nothing seems to have changed? This page explains what eczema and its most common form, atopic dermatitis, are, what current sources say about why it happens, how it is recognised, and what the general approaches to managing it look like. It describes; it does not diagnose or advise on treatment for any one person.

What eczema and atopic dermatitis are

"Eczema" is an umbrella term for several inflammatory skin conditions that cause itchy, red or irritated skin. Atopic dermatitis is the most common type. The American Academy of Dermatology describes it as a common condition that causes itchy, dry and inflamed skin, and lists contact dermatitis and stasis dermatitis as other types of eczema. In everyday speech the two words are often used interchangeably, and many public bodies do the same.

The National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) calls atopic dermatitis a chronic disease that causes inflammation, redness and irritation of the skin. Chronic here means long-running, with periods of flare-ups and calmer stretches. It is not contagious.

The skin barrier and the itch-scratch cycle

The outer layer of skin works like a wall that keeps moisture in and irritants, germs and allergens out. NIAMS explains that in atopic dermatitis, changes in this protective layer allow the skin to lose moisture. Dry skin is more easily damaged and inflamed, and inflamed skin is itchier.

DermNet, a clinical reference site, makes a notable point about the long term. It states that even when atopic dermatitis improves during the school years, the barrier function of the skin is never completely normal. That is one reason sensitive skin can persist for life even in people whose eczema has quieted.

Then there is the itch. NIAMS says newer research suggests that inflammation directly triggers sensations of itch, which in turn cause a person to scratch. Scratching damages the skin further and raises the risk of bacterial infection. That creates a loop: itch, scratch, damaged barrier, more inflammation, more itch. Clinicians often call it the itch-scratch cycle, and much of everyday eczema care is aimed at breaking it at one point or another.

Who gets it and how common it is

Atopic dermatitis usually starts early. The American Academy of Dermatology says it often appears between 2 months and 5 years of age, and that most people who develop it do so by age 5, though it can begin in puberty or later. The National Eczema Association, a US patient organisation, summarises published research this way: onset before age 6 in 80 percent of those affected, and adult-onset symptoms reported by about 1 in 4 adults with the condition.

On how many people are affected, the National Eczema Association reports worldwide estimates of 10 to 20 percent of children and 2 to 10 percent of adults, and an estimate of 16.5 million US adults with atopic dermatitis. Figures like these come from surveys that define the condition in different ways, so they vary between studies and countries. Treat them as ranges, not exact counts.

Some risk factors are described consistently. NIAMS says risk is higher with a family history of atopic dermatitis, hay fever or asthma, that women and girls are slightly more often affected than men and boys, and that research shows it is more common in non-Hispanic Black children in the United States. The NHS gives a similar picture, noting that having a parent with eczema, or a close family member with asthma or hay fever, raises the likelihood.

What causes it, and what sources say about triggers

No single cause has been identified. According to NIAMS, contributors include genetic changes that affect a protein needed for a healthy skin barrier, problems with the immune system, and environmental exposures such as tobacco smoke, certain air pollutants, fragrances and compounds in skin products and soaps, and excessively dry skin. The NHS is plain about the uncertainty: it says it is not always known what causes atopic eczema.

Triggers are different from causes. A trigger is something that appears to set off a flare in a person who already has the condition. The NHS lists possible triggers including soaps and detergents, pets, some fabrics, pollen, house-dust mites, certain foods, heat or temperature changes, skin infections, stress and hormonal changes such as those during pregnancy.

Notice the word "possible". Triggers differ greatly from person to person, and a food or fabric that seems suspicious for one child may be irrelevant for another. The American Academy of Dermatology's advice is to find out what triggers your own flare-ups and avoid known triggers, which in practice is something people usually work out with a clinician, not alone. Blanket elimination, especially of foods, is something to discuss with a doctor, since NIAMS itself suggests talking to a doctor about food allergies.

Links with asthma and hay fever

Eczema, asthma and hay fever (allergic rhinitis) often appear in the same person or the same family. The three are sometimes grouped as "atopic" conditions. NIAMS notes that people with atopic dermatitis often also have asthma and allergies, including food allergies, and that researchers are still studying why having atopic dermatitis as a child can lead to asthma and hay fever later in life.

The National Eczema Association cites a study (Ravnborg and colleagues, 2021) reporting asthma in about 25 percent of people with atopic dermatitis compared with about 8 percent of people without it. That is a striking gap, and it shows association, not that one condition causes the other. A reasonable reading is that they share underlying tendencies in the immune system and the skin and airway linings, while the details remain under study.

How atopic dermatitis is diagnosed

There is no single blood test or scan that confirms atopic dermatitis. DermNet states that it is usually diagnosed clinically and that investigations are not required. Clinicians look at the pattern: itch, dryness, a relapsing course with flares, and a typical distribution that changes with age. The NHS says it often appears on the elbows, knees and hands, and on the face in babies and toddlers.

NIAMS describes the process in more detail. A doctor reviews the medical history, including family allergies, related conditions, sleep problems, possible food triggers, past treatments and irritant exposure, then examines the skin. Lab work may include blood tests to rule out other causes, and sometimes a skin biopsy (a small sample of skin examined under a microscope) is taken to exclude look-alike conditions. If you are curious about the broader logic, how dermatologists diagnose skin conditions covers the general toolkit, and skin biopsy, what to expect explains that specific procedure.

Patch testing is a separate matter. It looks for allergic contact dermatitis, in which skin reacts to a substance it touches. DermNet notes that patch testing should be considered, particularly if the dermatitis becomes resistant to treatment, because contact dermatitis is an important look-alike. Doctors also use scoring tools such as EASI and SCORAD to document severity so that changes can be tracked over time.

General management themes

The sources agree on one framing: atopic dermatitis cannot currently be cured, but it can usually be managed. The NHS says exactly that, and the American Academy of Dermatology adds that treatment can ease symptoms and lead to clearer skin. What follows is a map of the categories named bodies describe, not a plan for anyone.

Moisturisers (also called emollients) come first in nearly every source. NIAMS says moisturising creams can help restore the skin barrier, and the NHS lists emollients as creams, lotions, ointments and gels used on the skin and in place of soap. NIAMS also describes everyday skin-care habits: lukewarm baths, mild unscented cleansers, patting the skin dry and moisturising soon afterwards, protecting skin from irritants and rough fabrics such as wool, and keeping fingernails short, especially for children.

Topical anti-inflammatory medicines come next. NIAMS names corticosteroid creams and ointments, which decrease inflammation; topical calcineurin inhibitors, which also reduce inflammation and help prevent flares; and topical phosphodiesterase-4 inhibitors, which may be used when symptoms do not respond to other treatments. The NHS lists topical corticosteroids (steroid creams, lotions or gels) among its treatment options, and says a GP can prescribe them or refer to a dermatologist. How strong a product is, where it can be used and for how long are decisions for a prescriber, and they are not covered here.

For more severe or widespread disease, NIAMS describes light therapy (phototherapy) using ultraviolet A or B light. It also describes newer targeted therapies: biologic medicines, given by injection just under the skin, that block specific immune functions, and Janus kinase (JAK) inhibitors, pills that act on inflammation inside cells. NIAMS says both are reserved for more severe disease and require close monitoring. Antibiotics are used if skin infections develop, and some doctors recommend approaches such as bleach baths or wet wraps, but NIAMS stresses this should happen only under a doctor's instructions.

Outlook and living with it

Many parents ask whether a child will grow out of it. The honest answer is that it depends and cannot be predicted for an individual. The American Academy of Dermatology says some children outgrow atopic dermatitis by their teenage years while others have it for life. DermNet reports a meta-analysis of over 110,000 people in which 20 percent of children still had persistent disease 8 years later and fewer than 5 percent at 20 years, with disease typically worst at ages 2 to 4. It can also recur in adult life with exposure to irritants or allergens.

Daily life is where the condition is really felt. Sleep disturbance is common; the National Eczema Association cites a figure of 67 percent of children with atopic dermatitis affected. Work can be affected too. The American Academy of Dermatology notes that wet work, meaning frequent or prolonged contact with water or liquids, can irritate skin that has had atopic dermatitis, and that people whose skin cracks or bleeds with such work may be able to get help from a dermatologist to keep working.

When should a flare prompt medical attention? The NHS lists warning signs such as signs of infection, pain, sudden worsening or fever. If you are preparing for an appointment, preparing for a dermatology visit suggests what is useful to bring. Eczema also overlaps with other inflammatory skin diseases; psoriasis explained describes how a different immune-driven condition looks and is treated.

Honest limits

Several things are uncertain. The causes are only partly understood, and why eczema in childhood sometimes leads to asthma and hay fever is still being studied. Prevalence figures depend on how surveys define the disease. Triggers are individual, and what helps one person may do little for another. Newer medicines are described by NIAMS as requiring close monitoring, which is a reminder that they involve trade-offs best weighed with a specialist.

This page is educational and has not been written or reviewed by a clinician. Individual care varies with age, skin tone, severity, other health conditions and local practice, which differs between countries. Your own doctor or specialist has the final word on diagnosis and treatment.

The short version

Atopic dermatitis is a long-running, non-contagious inflammatory skin condition tied to a weakened skin barrier, an overactive immune response and an itch-scratch cycle. It is common, often begins in early childhood, and is diagnosed mainly by history and examination. Management centres on moisturisers, trigger awareness and topical anti-inflammatory medicines, with light therapy and newer targeted treatments for more severe disease, all decided with a clinician.