The research emerged from the Global Access to Skin Health Observatory, known as SkinObservatory, a collaboration between the International League of Dermatological Societies (ILDS) and L’Oréal Dermatological Beauty. Representatives from 194 World Health Organization member countries were invited to participate, and respondents from 136 countries ultimately contributed data covering all four World Bank income classifications. Participants were asked to share insights on climate impacts and the observed prevalence of climate change-related skin diseases within their borders. Overall, 42.6 percent of responding countries reported changes in the prevalence or severity of skin disease attributable to climate change, but that headline figure conceals stark differences tied to national wealth and geography.

The income-based gradient was striking. More than half of low-income countries, 55.6 percent, reported climate-related changes in skin disease, as did 52.5 percent of lower-middle-income countries. By contrast, 43.8 percent of upper-middle-income countries and only 28.3 percent of high-income countries reported such changes. The pattern suggests that the nations least responsible for greenhouse gas emissions are the ones most likely to be witnessing dermatological consequences, a finding the study authors describe as a stark illustration of global inequality. Geographical disparities were equally pronounced. Changes were most frequently reported in the Western Pacific Region at 64.7 percent, followed by the Eastern Mediterranean and South-East Asian regions at 60.0 percent each. In the European Region, only 16.1 percent of respondents reported such changes, while in the African Region, 42.9 percent of respondents were unsure about the impact of climate change on skin disease, a figure that highlights potential gaps in surveillance and evidence rather than an absence of impact.

Among the 58 countries that reported climate-associated effects on skin disease, the specific conditions affected paint a detailed clinical picture. Heat rashes topped the list, with 81.0 percent of these countries reporting increases. Inflammatory skin diseases followed closely, with 75.9 percent reporting rises. Changes in infectious diseases were reported by 62.1 percent of affected countries, and half of them, 50.0 percent, specifically reported changes in vector-borne diseases, the category that includes illnesses transmitted by mosquitoes, ticks, and other arthropods. These numbers suggest that climate change acts on the skin through multiple simultaneous pathways, some of them direct physiological effects of heat and humidity, and others mediated by ecological shifts in the distribution of disease-carrying organisms.

Study author Dr. Esther Freeman, the L’Oréal/CeraVe Endowed Chair of Global Health Dermatology at Massachusetts General Hospital and Director of Global Health Dermatology at Massachusetts General Hospital and Harvard Medical School, emphasized that the skin occupies a unique position in the body’s encounter with a changing environment. “We often think about the effects of extreme weather on heatstroke, cardiovascular problems and respiratory diseases, but the skin is our front line to climate change,” she said. Her point is more than rhetorical. The skin is the largest organ of the human body and the primary physical interface between internal physiology and the external world, which means it registers environmental stressors first and most visibly. Rising ambient temperatures and elevated humidity increase sweating, which can macerate the skin barrier and provoke irritation, while heat, air pollution, and other environmental exposures may trigger or worsen inflammatory conditions such as eczema and other dermatitis syndromes.

The vector-borne dimension adds another layer of complexity. As Dr. Freeman explained, shifts in temperature and rainfall can alter the habitats of mosquitoes, ticks, and other disease vectors, potentially allowing them to survive in places where they were previously uncommon. This ecological expansion has direct dermatological consequences, from bites and infestations to the cutaneous manifestations of diseases such as dengue, leishmaniasis, and other infections whose geographic ranges track the movements of their arthropod or animal hosts. Changes in rainfall patterns and flooding can also influence waterborne and soil-related infections that present through the skin, while climate-related migration and ecosystem disruption can move susceptible populations into contact with pathogens and environmental hazards they have never previously encountered. The study’s authors note that these interacting mechanisms, thermal, inflammatory, infectious, and demographic, together explain why the reported effects span such a broad range of conditions rather than clustering around a single disease category.

Underlying all of these mechanisms is a compounding vulnerability that the researchers describe in sobering terms. “Despite contributing the least to climate change, countries with fewer resources were more likely to report climate-related dermatological changes,” the authors noted. “This is especially alarming since these are often the same countries with the least capacity to adapt.” Many lower-income countries are located in regions experiencing extreme heat, flooding, and changing rainfall patterns, while simultaneously facing limited access to healthcare, dermatologists, medicines, and public health infrastructure. The result is a convergence in which the greatest environmental health risks coexist with health systems that have the fewest resources to prevent, identify, and treat disease. In practical terms, a country where heat and humidity are intensifying may have only a handful of trained dermatologists for its entire population, few diagnostic laboratories, and constrained supplies of topical and systemic therapies, making even well-characterized conditions far harder to manage as their prevalence climbs.

The finding that 42.9 percent of African Region respondents were unsure about climate impacts on skin disease deserves particular attention. Uncertainty at this scale is itself a data point, signaling that surveillance systems and research capacity in parts of the continent may be insufficient to detect and characterize changes that are very likely occurring. Without reliable baseline data on disease prevalence, health authorities cannot distinguish genuine climate-driven trends from background variation, cannot allocate resources efficiently, and cannot evaluate whether interventions are working. The study’s authors argue that this evidence gap is not a peripheral concern but a central obstacle to protecting skin health in the era of climate change, and they call for stronger surveillance, education, and locally tailored strategies, particularly in resource-limited settings where the need is greatest.

The response the researchers propose is deliberately practical. “We need to start treating skin health as part of climate-health preparedness,” Dr. Freeman concluded. “This means strengthening surveillance so changes can be detected earlier, improving education and awareness among healthcare professionals and communities and developing adaptation strategies that reflect local climate exposures, disease patterns and health-system resources.” In other words, dermatology should be integrated into the same planning frameworks that governments already use for heat emergencies, vector control, and disaster response. Surveillance networks could track presentations such as heat rash, inflammatory flares, and vector-borne infections as climate indicators. Training programs could equip generalist health workers in underserved regions to recognize and manage climate-sensitive skin conditions. Adaptation measures, from cooling infrastructure to vector control tailored to local ecology, could be designed with dermatological outcomes explicitly in mind rather than treated as an afterthought.

Presented at the EADV Congress 2026, held in Vienna and online from 30 September to 3 October 2026, the SkinObservatory findings arrive at a moment when the medical community is increasingly recognizing that climate change is a present-tense clinical reality rather than a forecast. The study’s global scope, 136 countries, four income groups, and multiple WHO regions, gives it a breadth that few previous assessments of climate and skin disease have achieved, and its central message is difficult to ignore: the skin, the body’s front line against the environment, is already registering the consequences of a warming world, and the places being hit hardest are those with the fewest tools to respond. Further details of the observatory and its ongoing work are available at skinobservatory.org, where the collaboration between the ILDS and L’Oréal Dermatological Beauty continues to map access to skin health care worldwide.

Subject of Research: The global impact of climate change on the prevalence and severity of skin diseases

Article Title: New study reveals major impact of climate change on skin health worldwide

Article References: New study reveals major impact of climate change on skin health worldwide. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: climate change, skin health, dermatology, EADV Congress 2026, SkinObservatory, global health, heat rash, inflammatory skin disease, vector-borne disease, health inequality, surveillance, Esther Freeman