{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T14:52:00Z","timestamp":1790520720394,"version":"4.1.0"},"reference-count":62,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,12,30]],"date-time":"2025-12-30T00:00:00Z","timestamp":1767052800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,12,30]],"date-time":"2025-12-30T00:00:00Z","timestamp":1767052800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Contact Dermatitis"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Hair cosmetic products contain various chemicals which are partly potent contact sensitizers. These may cause occupational hand eczema in hairdressers, but also scalp and face dermatitis in consumers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To (i) highlight differences between the spectrum of occupational and non\u2010occupational exposure reflected in sensitization, and (ii) correlate trends in the last decades with regulatory interventions (or the lack thereof).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Patch test and clinical data collected by the IVDK (\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ivdk.org\">https:\/\/www.ivdk.org<\/jats:ext-link>\n                      ) between 01\/1995 and 12\/2020 were subjected to a pooled re\u2010analysis. Age\u2010stratified sensitization prevalences in female hairdressers and consumers, respectively, were calculated for 2\u2010yearly intervals spanning the study period. Log\u2010binomial regression models were employed to estimate the association between contact allergy and (i) subgroup (hairdresser vs. consumer), (ii) a 3\u2010level age category, and\/or (iii) time period, respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Hair dyes were the most frequent sensitizers in hairdressers and consumers; however, there was a marked increase in (particularly the young) consumers. Pyrogallol had been banned in 1992 but still elicited positive patch test reactions even in the young. Hydroquinone, banned in 2013 in dyes, showed no decline in sensitization prevalence. Glyceryl thioglycolate has been withdrawn and later banned in Germany since around 1995, which caused contact allergy prevalence to drop to almost zero in the youngest age group, largely until today.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>As a limitation, putatively differing selection for patch testing render prevalences difficult to compare between hairdressers and consumers. The importance of hair dye allergy is evident, needing continued efforts to increase product safety from the manufacturing and regulatory side. The potential of (self\u2010)regulatory intervention is well illustrated by the decline of contact allergy to glyceryl thioglycolate.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/cod.70079","type":"journal-article","created":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T06:35:36Z","timestamp":1767162936000},"page":"347-363","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Contact Allergy to Ingredients of Hair Cosmetics Associated with Occupational and Non\u2010Occupational Exposure\u2014Trends from 1995 to 2020 in Central Europe, with or without Regulation"],"prefix":"10.1111","volume":"94","author":[{"given":"Wolfgang","family":"Uter","sequence":"first","affiliation":[{"name":"Department of Medical Informatics Biometry and Epidemiology, University of Erlangen\/N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-9756-656X","authenticated-orcid":false,"given":"Jakob Ferl\u00f8v Baselius","family":"Schwensen","sequence":"additional","affiliation":[{"name":"National Allergy Research Centre, Department of Dermatology and Allergy Herlev and Gentofte Hospital, University of Copenhagen  Hellerup Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brunhilde","family":"Bl\u00f6meke","sequence":"additional","affiliation":[{"name":"Department of Environmental Toxicology Trier University  Trier Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8985-7582","authenticated-orcid":false,"given":"Olaf","family":"Gefeller","sequence":"additional","affiliation":[{"name":"Department of Medical Informatics Biometry and Epidemiology, University of Erlangen\/N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Swen M.","family":"John","sequence":"additional","affiliation":[{"name":"Department of Dermatology Environmental Medicine and Health Theory, Osnabr\u00fcck University  Osnabr\u00fcck Germany"},{"name":"Institute for Interdisciplinary Dermatologic Prevention and Rehabilitation (iDerm) Osnabr\u00fcck University  Osnabr\u00fcck Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cara","family":"Bieck","sequence":"additional","affiliation":[{"name":"Department of Dermatology Environmental Medicine and Health Theory, Osnabr\u00fcck University  Osnabr\u00fcck Germany"},{"name":"Division of Occupational Medicine, Department of Occupational Medicine Hazardous Substances and Health Sciences, Statutory Accident Insurance for the Health and Welfare Services  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2359-2518","authenticated-orcid":false,"given":"Steffen","family":"Schubert","sequence":"additional","affiliation":[{"name":"Information Network of Departments of Dermatology Institute at the Georg\u2010August University, University Medical Center  G\u00f6ttingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,12,30]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14055"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14048"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14056"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph19137588"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14236"},{"issue":"1","key":"e_1_2_10_7_1","article-title":"Regulation (EC) No 1223\/2009 of 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