Health outcome · symptom
Atopic dermatitis symptoms
Part of: Atopic dermatitis (eczema)
Also: eczema symptoms, SCORAD, atopic dermatitis severity
The severity of atopic dermatitis as measured on a scale rather than the presence of the disease — itching, redness, oozing, thickening and sleep loss, scored by instruments such as SCORAD and the Eczema Area and Severity Index.
Not reviewed by a clinician. This entry describes a disease or a symptom. We are introducing clinical review for pages of this kind; until that reviewer is in place, this page has been written and checked by the Coridum team but not reviewed by a clinician. It is general information and not medical advice. How this library is built is described in How we build this library.
Why it matters indoors
Symptom severity and the disease itself are different questions, and Coridum keeps them apart deliberately. Whether an indoor exposure makes someone develop atopic dermatitis is a question about incidence, answered by cohorts over years. Whether it makes an existing case worse this week is a question about severity, answered by a score repeated over days — and it is the one a household can act on.
A claim about symptoms is never raised to a claim about the disease. A study showing that a score falls when a room changes says nothing about whether the room caused the condition.
What has been measured
In a study of children, symptoms increased by 12.7 % (95 % CI −0.01 to 27.1) two days after indoor toluene rose by 1 ppb (F-0006), and by 12.0 % (95 % CI −0.9 to 26.6) with a 1 ppb rise in benzene, where significance was borderline (F-0005). Both intervals include zero at the lower end, which is why the language here stays at “suggests”.
In a comparison of wallpapers, the fall in SCORAD was greater in rooms papered with a material made without added emissions than in rooms with polyvinyl chloride wallpaper, but the difference was not statistically significant (F-0027).
What to measure
The score is recorded by a clinician or, for daily tracking, by a validated symptom diary. What the room contributes is measured separately: volatile organic compounds, and where an analysis can name individual compounds, the ones the studies above identify.
Indoor factors with evidence
| Factor | Effect | Population | Study design | Source | Checked |
|---|---|---|---|---|---|
| Formaldehyde (CH₂O) | difference 79.2 (19.6–168.4) per 10 % | children with moderate-to-severe atopic dermatitis · home | longitudinal (panel) study of children with moderate-to-severe atopic dermatitis in Seoul: real-time indoor formaldehyde monitoring at home and daily symptom scores (4,789 person-days), generalized linear mixed models adjusted for ambient PM2.5, temperature and relative humidity | F-0278 Harmful Effect of Indoor Formaldehyde on Atopic Dermatitis i… (2021) | machine |
| Formaldehyde (CH₂O) | difference 39.9 (14.3–71.2) per 10 % | children with moderate-to-severe atopic dermatitis · home | longitudinal (panel) study of children with moderate-to-severe atopic dermatitis in Seoul: real-time indoor formaldehyde monitoring at home and daily symptom scores (4,789 person-days), generalized linear mixed models adjusted for ambient PM2.5, temperature and relative humidity | F-0279 Harmful Effect of Indoor Formaldehyde on Atopic Dermatitis i… (2021) | machine |
| Formaldehyde (CH₂O) | difference 28.0 (6.6–53.7) per 10 % | children aged 6 to 18 years with atopic dermatitis · home | longitudinal (panel) study of children with moderate-to-severe atopic dermatitis in Seoul: real-time indoor formaldehyde monitoring at home and daily symptom scores (4,789 person-days), generalized linear mixed models adjusted for ambient PM2.5, temperature and relative humidity | F-0280 Harmful Effect of Indoor Formaldehyde on Atopic Dermatitis i… (2021) | machine |
| Formaldehyde (CH₂O) | difference 17.8 (3.9–33.6) per 10 % | children with moderate-to-severe atopic dermatitis · home | longitudinal (panel) study of children with moderate-to-severe atopic dermatitis in Seoul: real-time indoor formaldehyde monitoring at home and daily symptom scores (4,789 person-days), generalized linear mixed models adjusted for ambient PM2.5, temperature and relative humidity | F-0281 Harmful Effect of Indoor Formaldehyde on Atopic Dermatitis i… (2021) | machine |
| Formaldehyde (CH₂O) | difference 2.5 per 10 % | children with moderate-to-severe atopic dermatitis · home | longitudinal (panel) study of children with moderate-to-severe atopic dermatitis in Seoul: real-time indoor formaldehyde monitoring at home and daily symptom scores (4,789 person-days), generalized linear mixed models adjusted for ambient PM2.5, temperature and relative humidity | F-0282 Harmful Effect of Indoor Formaldehyde on Atopic Dermatitis i… (2021) | machine |
| Benzene | difference 12.0 (-0.9–26.6) per 1 ppb of indoor benzene % · borderline | children with atopic dermatitis · home | panel study of children with atopic dermatitis in Korea: indoor volatile organic compounds and other pollutants measured in the homes alongside daily symptom scores, analysed in unlagged and lagged models | F-1125 Kim et al. Indoor air pollution aggravates symptoms of atopic dermatiti… (2015) | machine |
| Toluene (C₇H₈) | difference 12.7 (-0.01–27.1) per 1 ppb of indoor toluene % | children with atopic dermatitis · home | panel study of children with atopic dermatitis in Korea: indoor volatile organic compounds and other pollutants measured in the homes alongside daily symptom scores, analysed in unlagged and lagged models | F-1126 Kim et al. Indoor air pollution aggravates symptoms of atopic dermatiti… (2015) | machine |
| Volatile organic compounds (VOCs) | — | children · home | randomised controlled trial of wallpaper replacement, eight weeks | F-0027 Kim et al. Effects of indoor air pollutants on atopic dermatitis (2016) | machine |
| Benzene | difference 12.0 (-0.9–26.6) per 1 % · borderline | children · day-care centre | prospective longitudinal (panel) study in a newly built day-care centre | F-0005 Kim et al. Indoor air pollution aggravates symptoms of atopic dermatiti… (2015) | machine |
| Toluene (C₇H₈) | difference 12.7 (-0.01–27.1) per 1 % · borderline | children · day-care centre | prospective longitudinal (panel) study in a newly built day-care centre | F-0006 Kim et al. Indoor air pollution aggravates symptoms of atopic dermatiti… (2015) | machine |
Each row is one Finding — a sentence as printed in one study, recorded with its page in the Coridum Knowledge Base. Follow the Finding number for the exact wording and the citation. Checked says who verified the row: machine means every automatic check passed and the surrounding text was read; person means someone read the sentence in the document. Rows are re-checked by a person over time. The studies are curated in the Coridum Knowledge Base; the reading of them together is a Claim, shown separately.
How strong is the evidence
-
In children, a single day-care cohort suggests that a rise in indoor toluene is followed two days later by more symptoms of atopic dermatitis; for benzene the same study found the association borderline and not statistically significant.
A Claim is Coridum reading the Findings together, not a quotation from one study — according to Coridum. The grade follows the study designs behind it: A is the strongest, D means a single study or a mechanism.
In the literature
- Kim et al. Indoor air pollution aggravates symptoms of atopic dermatitis in children (2015). PloS one. doi:10.1371/journal.pone.0119501 CKB 0608
- Kim et al. Effects of indoor air pollutants on atopic dermatitis (2016). International journal of environmental research and public health. doi:10.3390/ijerph13121220 CKB 0611
Studies in the Coridum Knowledge Base in which this term is used. The definition follows standard usage in WHO, ISO and textbook sources; it is not quoted from these papers.
CKB = document number in the Coridum Knowledge Base, our curated library of peer-reviewed studies. Follow the DOI for the original paper.
Cite this page
Coridum Research. Atopic dermatitis symptoms. Coridum Knowledge G-0107, 16 September 2026. https://coridum.com/k/G-0107/