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Some EOs contain contact sensitizers.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To describe the frequency of sensitization to EOs in dermatitis patients presenting in skin clinics including concomitant reactions, to evaluate the EO patch test preparations and to identify patient groups with an increased risk of EO sensitization.<\/jats:p><\/jats:sec><jats:sec><jats:title>Patients and methods<\/jats:title><jats:p>Retrospective analysis of data from the Information Network of Departments of Dermatology (IVDK), 2010\u20132019.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Twelve EOs were patch tested in an aimed manner in 10\u2009930 patients, of whom 908 (8.3%) reacted to at least 1 EO. Only 6 EOs elicited more than 1% positive patch test reactions: ylang ylang (I\u2009+\u2009II) oil (3.9%), lemongrass oil (2.6%), jasmine absolute (1.8%), sandalwood oil (1.8%), clove oil (1.6%) and neroli oil (1.1%). Concomitant reactions among EOs or to EOs and fragrances were frequent. Among EO\u2010positive patients, women, leg dermatitis patients, patients aged 40\u2009years or more, masseurs and cosmeticians were over\u2010represented.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Sensitization to EOs occurs, albeit infrequently in most cases. Masseurs and cosmeticians have an increased risk of sensitization to EOs.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cod.14126","type":"journal-article","created":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T18:39:26Z","timestamp":1649875166000},"page":"71-80","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Contact sensitization to essential oils: <scp>IVDK<\/scp> data of the years 2010\u20132019"],"prefix":"10.1111","volume":"87","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5047-8948","authenticated-orcid":false,"given":"Johannes","family":"Geier","sequence":"first","affiliation":[{"name":"Information Network of Departments of Dermatology (IVDK) Institute University Medical Center G\u00f6ttingen  G\u00f6ttingen 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 (IVDK) Institute University Medical Center G\u00f6ttingen  G\u00f6ttingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5248-4332","authenticated-orcid":false,"given":"Kristian","family":"Reich","sequence":"additional","affiliation":[{"name":"Translational Research in Inflammatory Skin Diseases University Medical Center Hamburg\u2010Eppendorf  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5670-8396","authenticated-orcid":false,"given":"Christoph","family":"Skudlik","sequence":"additional","affiliation":[{"name":"Institute for Interdisciplinary Dermatologic Prevention and Rehabilitation (iDerm) University of Osnabr\u00fcck and Dermatologic Centre, Trauma Hospital Hamburg  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4136-5036","authenticated-orcid":false,"given":"Barbara","family":"Ballmer\u2010Weber","sequence":"additional","affiliation":[{"name":"Clinic of Dermatology and Allergology Cantonal Hospital St. Gallen  St. Gallen Switzerland"},{"name":"Department of Dermatology University Hospital Zuerich  Zuerich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8549-5898","authenticated-orcid":false,"given":"Randolf","family":"Brehler","sequence":"additional","affiliation":[{"name":"Department of Dermatology University Hospital M\u00fcnster  M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7016-0224","authenticated-orcid":false,"given":"Elke","family":"Weisshaar","sequence":"additional","affiliation":[{"name":"Unit for Occupational Dermatology, Department of Dermatology Ruprecht\u2010Karls University  Heidelberg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4498-3710","authenticated-orcid":false,"given":"Wolfgang","family":"Uter","sequence":"additional","affiliation":[{"name":"Department of Medical Informatics, Biometry and Epidemiology University of Erlangen\/N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"for the IVDK","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,4,25]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"Monographs in Contact Allergy. 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