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PubMed This is a summary of 94 peer-reviewed journal articles Updated
Dermatology

Understanding Your Atopic Eczema Diagnosis

At a Glance

Atopic eczema (also called atopic dermatitis) is a chronic, non-contagious inflammatory disease driven by an overactive immune system, a weakened skin barrier, and a bacterial imbalance on the skin. While it appears as an itchy rash, it is a systemic condition that can be managed with targeted treatments.

A diagnosis of atopic eczema, also known as atopic dermatitis (AD), can feel overwhelming, but it is important to know that you are dealing with a well-understood medical condition. While it is often first noticed as a red, itchy rash, it is much more than just a skin problem [1]. It is a chronic (long-lasting), relapsing (comes and goes), and systemic (affecting the whole body) inflammatory disease [2][3].

Understanding the Basics

Atopic eczema is incredibly common. While it is most frequently diagnosed in infants and children, it often persists into adulthood or can even begin later in life [4]. In children, prevalence remains high globally, though rates can vary based on geographic location and environmental factors like UV exposure [4][5].

Three Reassuring Facts

If you or your child have just been diagnosed, keep these three stabilizing facts in mind:

  1. It is not contagious. You cannot “catch” eczema from someone else, and you cannot spread it to others through physical contact [2].
  2. It is a biological condition. Eczema is caused by a combination of genetics and immune system function; it is not the result of poor hygiene or anything you did “wrong” [6][7].
  3. Treatment has advanced rapidly. We are currently in an era of “targeted therapy.” For cases that do not respond to traditional creams, new medicines called biologics and JAK inhibitors specifically target the internal “switches” that cause inflammation [8][2].

Why It’s “Systemic”

Doctors call atopic eczema a systemic disease because the inflammation isn’t just on your skin—it’s in your immune system [1].

  • Immune Activation: Inflammation markers can be found circulating in the blood, even in areas where the skin looks clear [9].
  • The Atopic March: This term describes how the systemic nature of the disease can lead to other conditions. People with atopic eczema have a higher risk of developing “atopic” partners like asthma, hay fever, or food allergies over time [10][11].

The Three Core Issues

Researchers have identified three main “glitches” that happen in the body to cause atopic eczema:

Issue What it means in plain language
Skin Barrier Defect The skin is like a brick wall. In eczema, the “mortar” (proteins like filaggrin) is weak or missing, making the wall “leaky.” This allows moisture to escape and irritants to get in [6][12].
Type 2 Immune Dysregulation Your immune system is over-prepared. It overreacts to normal things in the environment, sending out a flood of signals (Type 2 inflammation) that cause redness and intense itching [13][14].
Microbiome Imbalance Your skin is home to many “good” bacteria. In eczema, this balance is disrupted (dysbiosis), allowing “bad” bacteria like Staphylococcus aureus to take over, which can lead to more inflammation or infection [3][15].

Current medical guidelines focus on a “proactive” approach: repairing the skin barrier daily with thick moisturizers (emollients) while using targeted medications to calm the overactive immune response [16][17].

Explore the Guide

01

How Atopic Eczema is Diagnosed and Distinguished

Learn how dermatologists diagnose atopic eczema without a blood test. Understand the clinical criteria, patch testing for mimics, and when a biopsy is needed.

02

Symptoms and Vital Warning Signs of Atopic Eczema

Learn how to spot atopic eczema symptoms, recognize how it looks on different skin tones, and identify critical warning signs of bacterial and viral infections.

03

The Step-Up Approach to Eczema Treatment

Learn the step-up approach to atopic eczema treatment. Understand when doctors prescribe emollients, steroid-sparing creams, biologics, or JAK inhibitor pills.

04

Building Your Care Team and Preparing for Your Visit

Learn how to build an atopic eczema care team and prepare for your dermatologist visit. Discover which treatment logs, photos, and questions to bring.

05

The Atopic March and Long-Term Wellness

Learn about the atopic march and how atopic eczema can lead to food allergies and asthma. Discover long-term tracking, treatments, and environmental triggers.

Common questions in this guide

Is atopic eczema contagious?
No, atopic eczema is not contagious. You cannot catch it from someone else, and you cannot spread it to others through physical contact. It is a biological condition caused by a combination of genetics and immune system function.
What causes atopic eczema?
Eczema is driven by three main factors: a leaky skin barrier that lets moisture escape, an overactive immune system that causes inflammation, and an imbalance of natural bacteria on the skin.
What is the atopic march?
The atopic march describes how the systemic inflammation of eczema can lead to other related conditions over time. People with atopic eczema have a higher risk of later developing asthma, hay fever, or food allergies.
Are there advanced treatments for severe atopic eczema?
Yes, eczema treatment has advanced rapidly. For patients whose skin does not improve with standard moisturizing creams, new targeted medications like biologics and JAK inhibitors can calm the specific internal signals causing the inflammation.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is the evidence that my (or my child's) eczema is systemic rather than just on the surface?
  2. 2.Based on current symptoms, do you see signs of 'type 2 inflammation' that might require targeted therapy?
  3. 3.How can we tell if the skin microbiome is out of balance, and what can we do to restore it?
  4. 4.Are there specific genetic factors, like a filaggrin mutation, that I should be aware of for long-term planning?
  5. 5.Given the 'atopic march,' what symptoms should I watch for that might indicate the development of asthma or allergies?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (17)
  1. 1

    [Pathophysiology of atopic blepharokeratoconjunctivitis].

    Lapp T, Maier P, Jakob T, Reinhard T

    Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft 2017; (114(6)):504-513 doi:10.1007/s00347-017-0483-1.

    PMID: 28361356
  2. 2

    Recent advances in atopic dermatitis.

    Ahn K, Kim BE, Kim J, Leung DY

    Current opinion in immunology 2020; (66()):14-21 doi:10.1016/j.coi.2020.02.007.

    PMID: 32299014
  3. 3

    [Atopic eczema and microbiome].

    Reiger M, Schwierzeck V, Traidl-Hoffmann C

    Der Hautarzt; Zeitschrift fur Dermatologie, Venerologie, und verwandte Gebiete 2019; (70(6)):407-415 doi:10.1007/s00105-019-4424-6.

    PMID: 31111169
  4. 4

    Clinical onset of atopic eczema: Results from 2 nationally representative British birth cohorts followed through midlife.

    Abuabara K, Ye M, McCulloch CE, et al.

    The Journal of allergy and clinical immunology 2019; (144(3)):710-719 doi:10.1016/j.jaci.2019.05.040.

    PMID: 31260715
  5. 5

    Global Associations between UVR Exposure and Current Eczema Prevalence in Children from ISAAC Phase Three.

    Fuertes E, Flohr C, Silverberg JI, et al.

    The Journal of investigative dermatology 2017; (137(6)):1248-1256 doi:10.1016/j.jid.2017.02.966.

    PMID: 28257795
  6. 6

    Basics and recent advances in the pathophysiology of atopic dermatitis.

    Nakahara T, Kido-Nakahara M, Tsuji G, Furue M

    The Journal of dermatology 2021; (48(2)):130-139 doi:10.1111/1346-8138.15664.

    PMID: 33118662
  7. 7

    Genetic Variants in Epidermal Differentiation Complex Genes as Predictive Biomarkers for Atopic Eczema, Allergic Sensitization, and Eczema-Associated Asthma in a 6-Year Follow-Up Case-Control Study in Children.

    Dębińska A, Danielewicz H, Sozańska B

    Journal of clinical medicine 2022; (11(16)) doi:10.3390/jcm11164865.

    PMID: 36013110
  8. 8

    The management of severe eczema in pregnancy.

    Keeling E, Smith CH, Woolf RT

    Clinical medicine (London, England) 2025; (25(1)):100282 doi:10.1016/j.clinme.2024.100282.

    PMID: 39733910
  9. 9

    Increasing Comorbidities Suggest that Atopic Dermatitis Is a Systemic Disorder.

    Brunner PM, Silverberg JI, Guttman-Yassky E, et al.

    The Journal of investigative dermatology 2017; (137(1)):18-25 doi:10.1016/j.jid.2016.08.022.

    PMID: 27771048
  10. 10

    Risk factors and temporal associations of progression of the atopic march in children with early-onset atopic dermatitis.

    Choi UE, Deng J, Parthasarathy V, et al.

    Journal of the American Academy of Dermatology 2025; (92(4)):732-740 doi:10.1016/j.jaad.2024.10.107.

    PMID: 39615548
  11. 11

    Phenotypes of atopic dermatitis and the risk for subsequent asthma: A systematic review and meta-analysis.

    Li H, Dai T, Liu C, et al.

    Journal of the American Academy of Dermatology 2022; (86(2)):365-372 doi:10.1016/j.jaad.2021.07.064.

    PMID: 34384834
  12. 12

    Contact dermatitis in the construction industry: the role of filaggrin loss-of-function mutations.

    Timmerman JG, Heederik D, Spee T, et al.

    The British journal of dermatology 2016; (174(2)):348-55 doi:10.1111/bjd.14215.

    PMID: 26451970
  13. 13

    Type 2 Inflammation and Its Role in Dermatologic Diseases.

    Chovatiya R, Hawkes JE, DiRuggiero D, et al.

    International journal of dermatology 2025; (64(6)):978-991 doi:10.1111/ijd.17707.

    PMID: 40119613
  14. 14

    The pruritogenic role of the type 2 immune response in diseases associated with chronic itch.

    Ingrasci G, Lipman ZM, Hawash AA, et al.

    Experimental dermatology 2021; (30(9)):1208-1217 doi:10.1111/exd.14401.

    PMID: 34033148
  15. 15

    Skin pH-dependent Staphylococcus aureus abundance as predictor for increasing atopic dermatitis severity.

    Hülpüsch C, Tremmel K, Hammel G, et al.

    Allergy 2020; (75(11)):2888-2898 doi:10.1111/all.14461.

    PMID: 32562575
  16. 16

    Atopic dermatitis (eczema) guidelines: 2023 American Academy of Allergy, Asthma and Immunology/American College of Allergy, Asthma and Immunology Joint Task Force on Practice Parameters GRADE- and Institute of Medicine-based recommendations.

    , Chu DK, Schneider L, et al.

    Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology 2024; (132(3)):274-312 doi:10.1016/j.anai.2023.11.009.

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    Atopic eczema.

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This page provides educational information about an atopic eczema diagnosis. It is not intended as medical advice; always consult your dermatologist or healthcare provider to discuss your specific symptoms and treatment plan.

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