Nationwide survey places skin disease among China’s largest adult health burdens
A nationwide skin disease survey in China estimates that more than half of adults are living with at least one dermatologic condition at any given time, a burden large enough to rival some of the country’s most visible chronic diseases. The age-standardised prevalence reached 55.6%, with an estimated 618 million affected adults nationwide. On a clinical level, the number is hard to ignore: the average participant carried 0.98 skin diseases, meaning dermatologic complaints were common rather than exceptional in this community-based sample.
The findings come from the China Skin Health study, a large population-based cross-sectional survey designed to fill a major epidemiologic gap. Skin disease had already been identified as a public health priority at the 78th World Health Assembly, but China lacked comprehensive national prevalence data. This study answers that gap with unusually broad coverage, using multistage stratified cluster random sampling to recruit a nationally representative adult cohort from diverse regions of the country.
Dermatologists examined more than 153,000 adults across five provinces
Between July 1, 2022, and June 27, 2024, 153,593 adults completed the survey and entered the analysis. The mean age was 48.5 years, and the cohort was nearly evenly split by sex, with 49.2% men and 50.8% women. Urban residents made up 64.4% of the sample. Community health centres served as the main data collection sites, while provincial centres for disease control and prevention coordinated survey teams that included public health workers and 10 to 12 certified dermatologists in each of the five participating provinces.
The screening approach was clinically direct. Trained interviewers administered standardised electronic questionnaires to capture demographic and related characteristics, and certified dermatologists inspected sun-exposed sites such as the scalp, face, neck, and extremities in every participant. Unexposed areas were examined when participants reported concerns. Diagnoses were based on observed skin manifestations, which strengthens the clinical credibility of the prevalence estimates because assessment did not rely on self-report alone.
Sampling weights derived from the survey framework and the 2020 National Population Census were applied in the prevalence analyses and logistic regression models. Nationwide case counts were then estimated by projecting prevalence onto census data. The result is not a narrow clinic-based snapshot but a population estimate with direct public health relevance.
Prevalence climbed sharply with age
Age emerged as one of the clearest gradients in the dataset. Among adults aged 18 to 29 years, prevalence was 42.0%. In those aged 80 years or older, it rose to 79.5%. The trajectory is biologically plausible: cumulative ultraviolet exposure, chronic inflammation, barrier dysfunction, medication effects, and the wear of aging skin all increase the likelihood of visible dermatologic disease over time. Skin is not a static organ, and age changes its structure, immune surveillance, and repair capacity in ways that make dermatologic conditions more frequent as the lifespan lengthens.
The sheer spread between the youngest and oldest adults also has practical consequences for service planning. A health system that treats dermatology as a narrow subspecialty will miss the scale of need implied by these data. Primary care, community screening, and referral pathways need to account for the fact that skin disease is common in older adults and not confined to specialty clinics.
A prevalence of 55.6% is not a minor signal. It represents the norm for adult skin health in this cohort.
Why population-based dermatology data matter for China’s health system
Cross-sectional prevalence data do not establish causality, and they do not measure disease severity, treatment uptake, or long-term outcomes. Even so, the numbers define the baseline burden that health services must absorb. A national estimate of 618 million affected adults implies major demand for diagnosis, chronic management, and patient education, especially when many common skin conditions are visible, symptomatic, and recurrent.
The study also carries methodological weight. Because certified dermatologists examined participants directly, the survey captures conditions that self-administered questionnaires can miss or misclassify. Standardised assessment across 12 categories and more than 60 specific conditions broadens the clinical net beyond a handful of familiar diagnoses. That approach is especially important in a country as large and geographically diverse as China, where environmental exposure, urbanisation, access to care, and demographic structure vary widely.
From a public health perspective, the data support stronger national surveillance. From a clinical perspective, they argue for earlier recognition of skin disease in routine care, especially in older adults. The burden revealed here is not abstract. It is encountered one patient at a time in community clinics, outpatient visits, and family practice settings, often long before specialist referral.
The limits of a cross-sectional map of disease burden
The survey provides prevalence, not progression. It cannot show which conditions are most likely to worsen, which are driven by preventable exposures, or how much of the burden is already treated versus untreated. It also focuses on dermatologic findings identified during the survey window, so it offers a point-in-time estimate rather than a longitudinal view of disease incidence.
Still, the central message is difficult to soften. Skin disease is widespread among adults in China, rises steeply with age, and affects a population measured in hundreds of millions. The study turns a long-recognised gap into a quantified burden, giving clinicians and policy makers a more concrete basis for surveillance, planning, and resource allocation.