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It is potentially life-threatening, and diagnosis of the underlying disease is a challenge. Despite laboratory improvements, many cases remain idiopathic. We aimed to analyze clinical and laboratory findings of 309 erythrodermic patients to find clues to the etiologic diagnosis. We performed a prospective study at the University of S\u00e3o Paulo Medical School, from 2007 to 2018, with patients with acquired erythroderma. Clinical, laboratory, histology, and molecular biology data were collected. The median age at diagnosis was 57 years, with a male-to-female ratio of 2.2. Eczema was the most frequent etiology (20.7%), followed by psoriasis (16.8%), S\u00e9zary syndrome (12.3%), drug eruption (12.3%), atopic dermatitis (8.7%), and mycosis fungoides (5.5%). Other diagnoses (6.8%) included pemphigus foliaceous, paraneoplastic erythroderma, adult T-cell leukemia\/lymphoma, dermatomyositis, pityriasis rubra pilaris, lichen planus, bullous pemphigoid, and leprosy. In 52 patients (16.8%), it was not possible to elucidate erythroderma etiology. Atopic dermatitis developed erythroderma at an earlier age (median 25 years; <jats:italic>P<\/jats:italic>\u2009=\u20090.0001). Acute onset was associated with drug reactions and atopic dermatitis (median time from erythroderma to diagnosis of 1 and 1.5 months, respectively; <jats:italic>P<\/jats:italic>\u2009=\u20090.0001). Higher immunoglobulin E levels were observed in atopic dermatitis (median 24,600\u2009U\/L; <jats:italic>P<\/jats:italic>\u2009=\u20090.0001). Histopathology was helpful and was consistent with the final diagnosis in 72.4%. Monoclonal T-cell proliferation in the skin was observed in mycosis fungoides (33.3%) and S\u00e9zary syndrome (90.9%). At the last assessment, 211 patients (69.3%) were alive with disease, 65 (21.7%) were alive without disease, and 27 (9.1%) died with active disease. Erythroderma is a challenging syndrome with a difficult diagnostic approach. Younger age and higher immunoglobulin E levels are associated with atopic dermatitis; acute onset is observed in drug eruptions and atopic dermatitis. Histopathology and molecular biology tests are essential tools in the investigation of erythroderma.<\/jats:p>","DOI":"10.1038\/s41598-020-66040-7","type":"journal-article","created":{"date-parts":[[2020,6,17]],"date-time":"2020-06-17T10:05:07Z","timestamp":1592388307000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":62,"title":["Erythroderma: a prospective study of 309 patients followed for 12 years in a tertiary center"],"prefix":"10.1038","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1959-4908","authenticated-orcid":false,"given":"Denis","family":"Miyashiro","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5709-092X","authenticated-orcid":false,"given":"Jos\u00e9 Antonio","family":"Sanches","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,6,17]]},"reference":[{"key":"66040_CR1","doi-asserted-by":"publisher","first-page":"104","DOI":"10.1046\/j.1365-4362.1998.00228.x","volume":"37","author":"S Pal","year":"1998","unstructured":"Pal, S. & Haroon, T. 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